BRKUCC-2932
Troubleshooting SIP with
Cisco Unified
Communications
Paul Giralt, Distinguished Services Engineer
(@PaulGiralt)
pgiralt@cisco.com
Cisco Spark
Questions?
Use Cisco Spark to communicate
with the speaker after the session
How
1.
Find this session in the Cisco Live Mobile App
2.
Click “Join the Discussion”
3.
Install Spark or go directly to the space
4.
Enter messages/questions in the space
cs.co/ciscolivebot#BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
Agenda
•
Introduction
•
Session Initiation Protocol (SIP) Overview
•
Troubleshooting Tools
•
Unified CM Tracing
•
Expressway / VCS Tracing
•
Cisco Unified Border Element (CUBE) Tracing
•
Sample Call Flows / Case Studies
•
Live Demos
SIP Protocol Overview
What is SIP?
•
Signaling protocol used to establish, manage, and terminate sessions over an IP
network
•
Core protocol defined in RFC 3261
•
Relies heavily on RFC 3262, RFC 3263, RFC 3264, and RFC 3265
•
Extended in many, many other RFCs
•
ASCII-based messages
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
6
What is SIP?
•
User Agents
•
SIP Messages
•
Requests and Responses
• Headers
•
Media Negotiation
•
•
•
•
•
Session Description Protocol
Offer/Answer Model
Early Offer vs. Delayed Offer
Early Media
DTMF Relay
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
7
User Agents
•
User Agent Clients (UAC) send requests to User Agent Servers (UAS)
•
User Agent Servers send responses to the requests
•
Most SIP devices are both a UAC and a UAS
(they both initiate and accept requests)
•
Unified CM and CUBE are both Back-to-Back User Agents (B2BUA)
(as opposed to Proxies)
•
Cisco VCS and Cisco Expressway operate as both proxies and B2BUA’s
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
8
SIP Request Methods from RFC 3261
•
INVITE - A user or service is being invited to participate in a multimedia session
•
ACK - Confirms that a client has received a final response to an INVITE request
•
BYE - Terminates an existing session; can be sent by any user agent
(in a multiparty session)
•
CANCEL - Cancels pending requests; does not terminate sessions that have
been accepted
•
OPTIONS - Queries the capabilities of servers (Also used as a keep alive)
•
REGISTER - Registers the user agent with the registrar server of a domain
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
9
Additional SIP Request Methods
•
INFO (RFC 2976) - to send more information within an established dialog
•
PRACK (RFC 3262) - to acknowledge a provisional response
•
SUBSCRIBE (RFC 3265) - to tell a remote node to look for a certain event
•
NOTIFY (RFC 3265) - to respond when that certain event occurs
•
UPDATE (RFC 3311) - to update parameters of a session set-up
•
MESSAGE (RFC 3428) - SIP instant messaging
•
REFER (RFC 3515) – to “refer” one UA to communicate with another UA
•
PUBLISH (RFC 3903) - to push UA state information to a compositor/presence
server
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
10
SIP INVITE Method
INVITE sip:+18775551234@172.18.159.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK1515b3154665
From: "Test User 1" <sip:9195551111@172.18.106.59>;tag=97903bc0-43adcd-45510543
To: <sip:+18775551234@172.18.159.231>
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
Supported: timer,resource-priority,replaces
User-Agent: Cisco-CUCM12.0
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Session-ID: 52c41df700105000a00074a02fc0cf3b;remote=00000000000000000000000000000000
Supported: Geolocation
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 2081204224-3137452793-0000000466-0996807340
Session-Expires: 1800
P-Asserted-Identity: "Test User 1" <sip:9195551111@172.18.106.59>
Contact: <sip:9195551111@172.18.106.59:5060>;video;audio
Max-Forwards: 69
Content-Length: 864
Content-Type: application/sdp
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
11
SIP Request Line
INVITE sip:+18775551234@172.18.159.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK1515b3154665
From: "Test User 1" <sip:9195551111@172.18.106.59>;tag=97903bc0-43adcd-45510543
To: <sip:+18775551234@172.18.159.231>
SIP Version
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
URI
Supported: timer,resource-priority,replaces
User-Agent: Cisco-CUCM12.0
Allow: INVITE,
OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER
SIP Method
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Session-ID: 52c41df700105000a00074a02fc0cf3b;remote=00000000000000000000000000000000
Supported: Geolocation
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 2081204224-3137452793-0000000466-0996807340
Session-Expires: 1800
P-Asserted-Identity: "Test User 1" <sip:9195551111@172.18.106.59>
Contact: <sip:9195551111@172.18.106.59:5060>;video;audio
Max-Forwards: 69
Content-Length: 864
Content-Type: application/sdp
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
12
SIP Headers
INVITE sip:+18775551234@172.18.159.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK1515b3154665
From: "Test User 1" <sip:9195551111@172.18.106.59>;tag=97903bc0-43adcd-45510543
To: <sip:+18775551234@172.18.159.231>
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
Supported: timer,resource-priority,replaces
User-Agent: Cisco-CUCM12.0
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Session-ID: 52c41df700105000a00074a02fc0cf3b;remote=00000000000000000000000000000000
Supported: Geolocation
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 2081204224-3137452793-0000000466-0996807340
Session-Expires: 1800
P-Asserted-Identity: "Test User 1" <sip:9195551111@172.18.106.59>
Contact: <sip:9195551111@172.18.106.59:5060>;video;audio
Max-Forwards: 69
Content-Length: 864
Content-Type: application/sdp
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
13
SIP Response
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bKb5291d44b969a4
From: "Test User 1" <sip:9195551111@172.18.106.59>;tag=97903bc0-43adcd-45510543
To: <sip:+18775551234@172.18.159.231>;tag=253488-726
Date: Mon, 16 Jan 2018 04:00:22 GMT
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
CSeq: 101 INVITE
Allow-Events: telephone-event
Session-ID: 747a0ead00105000a00074a02fc0cf3b;remote=52c41df700105000a00074a02fc0cf3b
Server: Cisco-SIPGateway/IOS-15.6.2.T
Reason: Q.850;cause=1
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
14
SIP Response
Free-text Reason
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bKb5291d44b969a4
From: "Test User 1" <sip:9195551111@172.18.106.59>;tag=97903bc0-43adcd-45510543
To: <sip:+18775551234@172.18.159.231>;tag=253488-726
Response
CodeGMT
Date: Mon, 16 Jan
2012 04:00:22
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
CSeq: 101 INVITE
Allow-Events: telephone-event
Session-ID: 747a0ead00105000a00074a02fc0cf3b;remote=52c41df700105000a00074a02fc0cf3b
Server: Cisco-SIPGateway/IOS-15.6.2.T
Reason: Q.850;cause=1
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
15
SIP Response
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bKb5291d44b969a4
From: "Test User 1" <sip:9195551111@172.18.106.59>;tag=97903bc0-43adcd-45510543
To: <sip:+18775551234@172.18.159.231>;tag=253488-726
Date: Mon, 16 Jan 2018 04:00:22 GMT
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
CSeq: 101 INVITE
Allow-Events: telephone-event
Session-ID: 747a0ead00105000a00074a02fc0cf3b;remote=52c41df700105000a00074a02fc0cf3b
Server: Cisco-SIPGateway/IOS-15.6.2.T
Reason: Q.850;cause=1
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
16
SIP Responses
Response Code
Description
Example
1xx
Informational – Request Received and Continuing to Process
Request
100 Trying
180 Ringing
183 Session Progress
2xx
Success – Action was successfully received, understood, and
accepted
200 OK
202 Acceptable
3xx
Redirection – Another SIP Element needs to be contacted in order
to complete the request
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
4xx
Client Error – Request contains bad syntax or cannot be fulfilled at
this server
401 Unauthorized
404 Not Found
406 Not Acceptable
486 Busy Here
488 Not Acceptable Here
5xx
Server Error – Server failed to fulfill an apparently valid request
503 Service Unavailable
6xx
Global Failure – Request is invalid at any server
600 Busy Everywhere
603 Decline
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
17
Basic SIP Call Setup
Unified CM
Phone 1
INVITE
200 OK
ACK
Session Established
BYE
200 OK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
18
Basic SIP Call Setup with B2BUA (Unified CM)
Unified CM
Phone 1
Phone 2
INVITE
INVITE
200 OK
200 OK
ACK
ACK
Session Established
BYE
BYE
200 OK
200 OK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
19
Basic SIP Call Setup with B2BUA (Unified CM)
Unified CM
Phone 1
SBC (CUBE)
CUBE
INVITE
INVITE
200 OK
200 OK
ACK
ACK
Session Established
BYE
BYE
200 OK
200 OK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
19
Basic SIP Call Setup with Unified CM and CUBE
SP SBC
Unified CM
Phone 1
SBC (CUBE)
SIP
SP
SBC
CUBE
INVITE
200 OK
INVITE
INVITE
200 OK
200 OK
ACK
ACK
ACK
Session Established
BYE
BYE
200 OK
BYE
200 OK
200 OK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
21
Media Negotiation
•
SIP leverages the Session Description Protocol (SDP)
(RFC 4566/3266/2327) to communicate media information.
•
SIP uses the offer/answer model described in RFC 3264 to negotiate media
using SDP
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
22
Offer/Answer Model (RFC 3264)
•
One endpoint sends an offer SDP containing all the capabilities the endpoint
wishes to negotiate.
•
SDP contains m lines for each media stream being negotiated (i.e. audio, video,
content channel, etc…)
•
Receiving endpoint sends an answer SDP that contains the same or a subset of
capabilities received in the offer.
•
Per RFC 3264, “For each "m=" line in the offer, there MUST be a corresponding
"m=“ line in the answer. The answer MUST contain exactly the same number of
"m=" lines as the offer.”
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
23
Session Description Protocol (SDP) - Offer
v=0
o=Cisco-SIPUA 26964 0 IN IP4 172.18.159.152
s=SIP Call
t=0 0
m=audio 29254 RTP/SAVP 0 8 18 102 9 116 124 101
c=IN IP4 172.18.159.152
a=crypto:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:102 L16/16000
a=rtpmap:9 G722/8000
a=rtpmap:116 iLBC/8000
a=fmtp:116 mode=20
a=rtpmap:124 ISAC/16000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
m=video 25466 RTP/AVP 97
c=IN IP4 172.18.159.152
b=TIAS:1000000
a=rtpmap:97 H264/90000
a=fmtp:97 profile-level-id=42801E
a=recvonly
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
24
Session Description Protocol (SDP) - Answer
v=0
o=CiscoSystemsCCM-SIP 2000 1 IN IP4 172.18.106.59
s=SIP Call
c=IN IP4 172.18.159.152
t=0 0
m=audio 30308 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
m=video 0 RTP/AVP 97
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
25
Media Negotiation – Early Offer and Delayed Offer
•
Initiator of the call can send SDP offer in the INVITE – this is called an Early
Offer (EO)
•
Receiving endpoint can send the SDP offer in a response if the INVITE did not
contain an offer – this is called a Delayed Offer (DO)
•
For Early Offer, the answer is sent in a response (usually 200 OK).
•
For Delayed Offer, the answer is typically sent in the ACK.
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
26
Early Offer
Unified CM
Phone 1
INVITE with SDP - Offer
200 OK with SDP - Answer
ACK (no SDP)
Session Established
BYE
200 OK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
27
Delayed Offer
Unified CM
Phone 1
INVITE (no SDP)
200 OK with SDP - Offer
ACK with SDP - Answer
Session Established
BYE
200 OK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
28
Early Media
•
Delayed Offer calls do not set up media until the 200 OK (call is answered)
•
If media is required prior to the call being connected, SIP has provisions for
Early Media
•
With Early Media on a Delayed Offer call, the offer comes from the terminating
side in a provisional response (e.g. 183 Session Progress)
•
Originating side sends SDP Answer in a PRACK message
(defined in RFC 3262)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
29
Early Media
Unified CM
Phone 1
INVITE (no SDP)
183 Session Progress with SDP - Offer
PRACK with SDP - Answer
Media Stream Established
200 OK (PRACK)
200 OK (INVITE) w/ SDP (should be same as answer)
ACK
Session Established
BYE
200 OK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
30
Media Re-negotiation
Re-INVITE
•
Either UA involved in a call can re-INVITE an existing dialog to re-negotiate
parameters for the call.
•
Cannot re-INVITE until any previous INVITE messages have received a final
response.
•
UPDATE method can also be used to re-negotiate prior to a final response.
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
31
Media Re-negotiation
Re-INVITE
INVITE sip:dbe40e44-0dfe-45f1-bd7f-e652098ca344@10.116.101.41:49833;transport=tls SIP/2.0
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK901f9c72c19221
From: "Paul Giralt" <sip:89915644@172.18.106.59>;tag=15462272~0d0d25d7-4931-4a07-83c6-b82e2c213ca7-45545776
To: <sip:89915644@172.18.106.59>;tag=0022bdd6843100702aae8e5b-4be253be
Date: Wed, 11 Jan 2018 03:08:51 GMT
Call-ID: 8c045780-f0c1fd34-8d838f-3b6a12ac@172.18.106.59
Supported: timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM12.0
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 104 INVITE
Max-Forwards: 70
Expires: 180
Allow-Events: presence
Call-Info: <urn:x-cisco-remotecc:callinfo>; security= Authenticated; orientation= from; gci= 2-231448; call-instance= 2
Remote-Party-ID: "Paul Giralt" <sip:89915644@172.18.106.59>;party=calling;screen=yes;privacy=off
Contact: <sip:89915644@172.18.106.59:5061;transport=tls>
Content-Type: application/sdp
Content-Length: 489
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
32
Media Re-negotiation
Re-INVITE – Stopping a Media Session
v=0
o=CiscoSystemsCCM-SIP 15462272 2 IN IP4 172.18.106.59
s=SIP Call
c=IN IP4 0.0.0.0
t=0 0
m=audio 19594 RTP/SAVP 9 101
a=crypto:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
a=rtpmap:9 G722/8000
a=ptime:20
a=inactive
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
m=video 19444 RTP/AVP 126
b=TIAS:1000000
a=rtpmap:126 H264/90000
a=fmtp:126 profile-level-id=42801E;packetization-mode=1;level-asymmetry-allowed=1
a=inactive
a=mid:227796888
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
33
Media Re-negotiation
Re-INVITE – Delayed Offer to Re-establish Media Stream
INVITE sip:dbe40e44-0dfe-45f1-bd7f-e652098ca344@10.116.101.41:49833;transport=tls SIP/2.0
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK901fac34c0fb1b
From: "Paul Giralt" <sip:89915644@172.18.106.59>;tag=15462272~0d0d25d7-4931-4a07-83c6-b82e2c213ca7-45545776
To: <sip:89915644@172.18.106.59>;tag=0022bdd6843100702aae8e5b-4be253be
Date: Wed, 11 Jan 2018 03:08:52 GMT
Call-ID: 8c045780-f0c1fd34-8d838f-3b6a12ac@172.18.106.59
Supported: timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM12.0
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 106 INVITE
Max-Forwards: 70
Expires: 180
Allow-Events: presence
Call-Info: <urn:x-cisco-remotecc:callinfo>; security= NotAuthenticated; orientation= from; gci= 2-231448; call-instance= 2
Remote-Party-ID: "Paul Giralt" <sip:89915644@172.18.106.59>;party=calling;screen=yes;privacy=off
Contact: <sip:89915644@172.18.106.59:5061;transport=tls>
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
34
Media Re-negotiation
Re-INVITE – Offer in 200 OK
SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK901fac34c0fb1b
From: "Paul Giralt" <sip:89915644@172.18.106.59>;tag=15462272~0d0d25d7-4931-4a07-83c6-b82e2c213ca7-45545776
To: <sip:89915644@172.18.106.59>;tag=0022bdd6843100702aae8e5b-4be253be
Call-ID: 8c045780-f0c1fd34-8d838f-3b6a12ac@172.18.106.59
Date: Wed, 11 Jan 2018 03:08:52 GMT
CSeq: 106 INVITE
Server: Cisco-8865/12.0.1
Contact: <sip:dbe40e44-0dfe-45f1-bd7f-e652098ca344@10.116.101.41:49833;transport=tls>
Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE,INFO
Remote-Party-ID: "Paul Giralt" <sip:89915644@172.18.106.59>;party=called;id-type=subscriber;privacy=off;screen=yes
Supported: replaces,join,sdp-anat,norefersub,extended-refer,X-cisco-callinfo,X-cisco-serviceuri,X-cisco-escapecodes,X-cisco-servicecontrol,X-cisco-srtp-fallback,X-cisco-monrec,X-cisco-config,X-cisco-sis-5.2.0,X-cisco-xsi-8.5.1
Allow-Events: kpml,dialog
Recv-Info: conference
Recv-Info: x-cisco-conference
Content-Length: 788
Content-Type: application/sdp
Content-Disposition: session;handling=optional
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
35
Media Re-negotiation
Re-INVITE – Offer in 200 OK
v=0
o=Cisco-SIPUA 26259 2 IN IP4 10.116.101.41
s=SIP Call
t=0 0
m=audio 32518 RTP/SAVP 0 8 18 102 9 116 124 101
c=IN IP4 10.116.101.41
a=crypto:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=rtpmap:102 L16/16000
a=rtpmap:9 G722/8000
a=rtpmap:116 iLBC/8000
a=rtpmap:124 ISAC/16000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
m=video 17614 RTP/AVP 126 97
c=IN IP4 10.116.101.41
b=TIAS:2500000
a=rtpmap:126 H264/90000
a=fmtp:126 profile-level-id=42801F;packetization-mode=1;level-asymmetry-allowed=1
a=rtpmap:97 H264/90000
a=fmtp:97 profile-level-id=42801F;packetization-mode=0;level-asymmetry-allowed=1
a=sendrecv
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
36
Media Re-negotiation
Re-INVITE – Answer in ACK
ACK sip:dbe40e44-0dfe-45f1-bd7f-e652098ca344@10.116.101.41:49833;transport=tls SIP/2.0
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK901fb064465a06
From: "Paul Giralt" <sip:89915644@172.18.106.59>;tag=15462272~0d0d25d7-4931-4a07-83c6-b82e2c213ca7-45545776
To: <sip:89915644@172.18.106.59>;tag=0022bdd6843100702aae8e5b-4be253be
Date: Wed, 11 Jan 2018 03:08:52 GMT
Call-ID: 8c045780-f0c1fd34-8d838f-3b6a12ac@172.18.106.59
Max-Forwards: 70
CSeq: 106 ACK
Allow-Events: presence
Content-Type: application/sdp
Content-Length: 446
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
37
Media Re-negotiation
Re-INVITE – Answer in ACK – Decline Video Support
v=0
o=CiscoSystemsCCM-SIP 15462272 3 IN IP4 172.18.106.59
s=SIP Call
t=0 0
m=audio 4000 RTP/SAVP 0
c=IN IP4 172.18.106.58
a=crypto:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
a=rtpmap:0 PCMU/8000
a=ptime:20
a=sendonly
m=video 0 RTP/AVP 126
c=IN IP4 10.116.101.50
b=TIAS:1000000
a=rtpmap:126 H264/90000
a=fmtp:126 profile-level-id=42801E;packetization-mode=1;level-asymmetry-allowed=1
a=mid:227796888
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
38
DTMF Relay
•
3 Methods for passing DTMF digits over a SIP network:
•
RFC 4933 (a.k.a. RFC 2833)
• SIP NOTIFY
• SIP Keypad Markup Language (KPML)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
39
DTMF Relay
RFC 4933 / RFC 2833
•
Digits are passed in the RTP stream with a unique payload type
•
Capability is negotiated in SDP like any other codec
Offer
m=audio 30414 RTP/AVP 0 8 116 18 100 101
c=IN IP4 172.18.106.231
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:116 iLBC/8000
a=fmtp:116 mode=20
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:100 X-NSE/800
a=fmtp:100 192-194
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
Answer
m=audio 17236 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
40
DTMF Relay
SIP NOTIFY
•
Passes DTMF information in a SIP NOTIFY message telephone-event Event
•
Negotiated in Call-Info header
“Offer”
INVITE sip:+19195553333@172.18.106.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK9843c455840434
From: "Paul Giralt" <sip:9195551234@172.18.106.59>;tag=14902469~0d0d25d7-4931-4a07-83c6
To: <sip:+19195553333@172.18.106.231>
Date: Mon, 13 May 2017 14:48:00 GMT
Call-ID: 1a189580-1901fd20-962c99-3b6a12ac@172.18.106.59
... snip ...
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Call-Info: <urn:x-cisco-remotecc:callinfo>;x-cisco-video-traffic-class=DESKTOP
... snip ...
Max-Forwards: 69
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
41
DTMF Relay
SIP NOTIFY
“Answer”
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK9843c455840434
From: "Paul Giralt" <sip:9195551234@172.18.106.59>;tag=14902469~0d0d25d7-4931-4a07-83c6
To: <sip:+19195553333@172.18.106.231>;tag=4363A830-17FC
Call-ID: 1a189580-1901fd20-962c99-3b6a12ac@172.18.106.59
... snip ...
Allow-Events: telephone-event
Call-Info: <sip:172.18.106.231:5060>;method="NOTIFY;Event=telephone-event;Duration=500”
... snip ...
Content-Length: 601
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
42
DTMF Relay
SIP NOTIFY
•
Digits passed in payload of a NOTIFY message
NOTIFY sip:172.18.106.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK98443140152a0a
From: "Paul Giralt" <sip:9195551234@172.18.106.59>;tag=14902469~0d0d25d7-4931-4a07-83c6
To: <sip:+19195553333@172.18.106.231>;tag=4363A830-17FC
Call-ID: 1a189580-1901fd20-962c99-3b6a12ac@172.18.106.59
CSeq: 104 NOTIFY
Max-Forwards: 70
Date: Mon, 13 May 2017 14:48:11 GMT
User-Agent: Cisco-CUCM12.0
Event: telephone-event
Subscription-State: active
Contact: <sip:172.18.106.59:5060>
P-Asserted-Identity: "Paul Giralt" <sip:9195551234@172.18.106.59>
Content-Type: audio/telephone-event
Content-Length: 4
.d
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
43
DTMF Relay
SIP KPML
• Passes DTMF information in a SIP NOTIFY message kpml Event
•
Capability advertised in Allow-Events – uses SUBSCRIBE message to subscribe
“Offer”
INVITE sip:+19195554444@172.18.106.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK986efd6c4e51e4
From: "Paul Giralt" <sip:9195551234@172.18.106.59>;tag=14918970~0d0d25d7-4931-4a07-83c6
To: <sip:+19195554444@172.18.106.231>
Date: Mon, 13 May 2017 15:05:24 GMT
Call-ID: 885e5780-19110134-96567f-3b6a12ac@172.18.106.59
User-Agent: Cisco-CUCM12.0
... snip ...
Allow-Events: presence, kpml
... snip ...
Session-Expires: 18000
Max-Forwards: 69
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
44
DTMF Relay
SIP KPML
“Answer”
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK986efd6c4e51e4
From: "Paul Giralt" <sip:9195551234@172.18.106.59>;tag=14918970~0d0d25d7-4931-4a07-83c6
To: <sip:+19195554444@172.18.106.231>;tag=437394E8-2E1
Date: Mon, 13 May 2017 15:05:26 GMT
Call-ID: 885e5780-19110134-96567f-3b6a12ac@172.18.106.59
CSeq: 101 INVITE
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO
Allow-Events: kpml, telephone-event
Remote-Party-ID: <sip:9196247285@172.18.106.231>;party=called;screen=no;privacy=off
Contact: <sip:+19196247285@172.18.106.231:5060>
Supported: replaces
Server: Cisco-SIPGateway/IOS-15.6.2.T
Require: timer
Session-Expires: 18000;refresher=uac
Content-Type: multipart/mixed;boundary=uniqueBoundary
Mime-Version: 1.0
Content-Length: 600
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
45
DTMF Relay
SIP KPML
Subscribe to KPML
SUBSCRIBE sip:9195554444@172.18.106.59:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.231:5060;branch=z9hG4bKBAE27139E
From: <sip:+19195551234@172.18.106.231>;tag=437394E8-2E1
To: "Paul Giralt" <sip:9195554444@172.18.106.59>;tag=14918970~0d0d25d7-4931-4a07-83c6
Call-ID: 885e5780-19110134-96567f-3b6a12ac@172.18.106.59
CSeq: 101 SUBSCRIBE
Max-Forwards: 70
User-Agent: Cisco-SIPGateway/IOS-15.6.2.T
Event: kpml
Expires: 7200
Contact: <sip:172.18.106.231:5060>
Content-Type: application/kpml-request+xml
Content-Length: 327
<?xml version="1.0" encoding="UTF-8"?><kpml-request xmlns="urn:ietf:params:xml:ns:kpml-request"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:ietf:params:xml:ns:kpml-request
kpml-request.xsd" version="1.0"><pattern persist="persist"><regex tag="dtmf">[x*#ABCD]</regex></pattern></kpmlrequest>
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
46
DTMF Relay
SIP KPML
Send a Digit
NOTIFY sip:172.18.106.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK986f73662cca3b
From: "Paul Giralt" <sip:9195554444@172.18.106.59>;tag=14918970~0d0d25d7-4931-4a07-83c6
To: <sip:+19195551234@172.18.106.231>;tag=437394E8-2E1
Call-ID: 885e5780-19110134-96567f-3b6a12ac@172.18.106.59
CSeq: 104 NOTIFY
Max-Forwards: 70
User-Agent: Cisco-CUCM12.0
Event: kpml
Subscription-State: active;expires=7197
Contact: <sip:9195554444@172.18.106.59:5060>
Content-Type: application/kpml-response+xml
Content-Length: 336
<?xml version="1.0" encoding="UTF-8" ?>
<kpml-response xmlns="urn:ietf:params:xml:ns:kpml-response" xmlns:xsi="http://www.w3.org/2001/XMLSchemainstance" xsi:schemaLocation="urn:ietf:params:xml:ns:kpml-response kpml-response.xsd" code="200" digits="1"
forced_flush="false" suppressed="false" tag="dtmf" text="Success" version="1.0"/>
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
47
SIP Session-ID (RFC 7989)
•
Session-ID Header carries an end-to-end session identifier
•
Allows you to track a call as it traverses through various SIP systems
Session-ID: 65596d4800105000a00074a02fc0d796;remote=747a0ead00105000a00074a02fc0cf3b
Remote UUID
Local UUID
•
Session Identifier represented as {A,B} referring to {local,remote} UUIDs
•
{A,B} is equivalent to {B,A}
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
48
SIP Call with Session-ID Headers
Phone 1
Unified CM
INVITE {A,N}
100 Trying {N,A}
200 OK {B,A}
ACK {A,B}
Phone 2
Phone 3
INVITE {A,N}
100 Trying {B,A}
200 OK {B,A}
ACK {A,B}
Session Established
REFER {B,A}
200 OK {A,B}
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
49
SIP Call with Session-ID Headers
Phone 1
Unified CM
Phone 2
Phone 3
INVITE {A,N}
200 OK {C,A}
re-INVITE {C,A}
200 OK {A,C}
ACK {A,C}
Session Established
BYE {A,B}
200 OK {B,A}
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
50
SIP Session-ID Support
•
Current Support:
•
•
•
•
•
•
•
•
Unified CM 11.0 and later
Jabber 11.5 and later
78XX/88XX Endpoints 11.0 and later
CUBE 15.6(2)T
CVP 11.5
VCS / Expressway X8.10
Cisco Spark
Planned Upcoming Support
•
DX & MX-series on CE software
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
51
Troubleshooting Tools
SIP Troubleshooting Tools
•
Unified CM / SME Tools:
•
Real Time Monitoring Tool / Session Trace
• TranslatorX
•
IOS (CUBE) and VCS Troubleshooting Tool:
•
•
TranslatorX
Wireshark
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
53
RTMT Session Trace Tool
Session Trace Features
•
Allows you to search for a call based on calling or called number
•
Does not depend on Call Detail Records (uses calllogs file)
•
Session trace only traces SIP sessions (no SCCP, H.323, or MGCP)
•
Can display raw SIP messages
•
Uses correlation tags to include all call legs related to the call selected
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
54
RTMT Session Trace Tool
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
55
RTMT Session Trace Tool
Call Flow Diagram
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
56
RTMT Session Trace Tool
Click on the message in the call flow diagram to see the actual message
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
57
TranslatorX Tool
Features
•
Parses through Unified CM SDI/SDL Trace Files (and CUBE, CUSP, VCS/Expressway,
Jabber 10.x+)
•
Drag-and-Drop support for .txt as well as .gz files.
•
Decodes SIP, SCCP, H.323, MGCP, Q.Sig, and ISDN Q.931 messages
•
Call List based on CDR information in the Traces
•
Can generate multi-protocol ladder diagrams
•
Sophisticated filtering capabilities (including Session-ID Support)
•
Download for Windows, Mac OS X, and Linux from: http://translatorx.org/
•
NOTE: Do not call TAC for support on TranslatorX (although many TAC engineers use it
so feel free to mention you’re using it)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
58
TranslatorX Tool
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
59
TranslatorX Tool – Call List Window
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
60
TranslatorX Tool – Call List Filtering
Double-click for complete
Call Detail Record
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
61
TranslatorX Tool – CDR View
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
62
TranslatorX Tool – CDR View
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
63
TranslatorX Tool – Generating Filters
Select a Call and click
“Generate Filter” button
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
64
TranslatorX Tool - Filters
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
65
TranslatorX Tool – Call Flow Diagram
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
66
TranslatorX Tool – Call Flow Diagram
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
67
Wireshark
Open Source network packet capture and analysis tool
Available at http://www.wireshark.org
Available for Windows, Mac OS X, and UNIX/Linux
Provides VoIP Call and SIP analysis
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
68
Wireshark
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
69
Wireshark
VoIP Call Analysis
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
70
Wireshark
VoIP Call Ladder Diagram
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
71
Wireshark
How to Gather a Trace?
•
Unified CM, VCS, and IOS provide a mechanism to gather a packet capture
•
Will be covered later
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
72
Unified CM Trace Configuration
Unified CM Trace Configuration
•
SIP messaging in Unified CM is written to the SDL trace file when appropriate
trace levels are set (SDI trace in for pre-9.0)
•
Configured from Cisco Unified Serviceability > Trace > Configuration or by
using Analysis Manager
•
Unified CM 9.0 and later combines SDI and SDL traces into the SDL traces
•
Unified CM 9.0 and later fresh install and later default to detailed tracing – no
need to configure traces.
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
74
Unified CM Trace Configuration
Select the
Server
Select Service
Group
Select the Service on
Which Trace Needs to
Be Enabled
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
75
Unified CM Trace Configuration
1. Press Set Default
Updates All Servers in
this cluster with
these settings
2. Set to Detailed
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
76
Unified CM Trace Configuration
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
77
Trace Collection
Various Ways to Collect Trace Files
•
RTMT Collect Files
•
RTMT Analysis Manager
•
RTMT Remote Browse
•
RTMT Query Wizard
•
OS CLI (file get or file tail)
•
Recommended
file tail activelog cm/trace/ccm/sdl recent
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
78
Reference
Gathering a Packet Capture from Unified CM
Use the Platform CLI command ‘utils network capture’
admin:utils network capture ?
Syntax:
utils network capture [options]
options optional
page, numeric, file fname, count num, size bytes, src addr, dest
addr, port num, host protocol addr
admin:utils network capture file capturefile count 100000 size ALL host ip 10.1.1.1
Executing command with options:
size=ALL
count=100000
interface=eth0
src=
dest=
port=
ip=10.1.1.1
admin:file list activelog platform/cli
capturefile.cap
dir count = 0, file count = 1
admin:file get activelog platform/cli/capturefile.cap
Please wait while the system is gathering files info ...done.
Sub-directories were not traversed.
Number of files affected: 1
Total size in Bytes: 24
Total size in Kbytes: 0.0234375
Would you like to proceed [y/n]? y
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
79
Expressway / VCS
Trace Configuration
VCS / Expressway Trace Configuration
•
VCS Control / VCS Expressway / Expressway-C / Expressway-E can log SIP
messages to a diagnostic log file.
•
To enable, navigate to Maintenance >
Diagnostics > Diagnostic logging
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
81
VCS / Expressway Trace Configuration
Select this if you want
to get a Wireshark
capture
Click Start new log
Click OK to Confirm
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
82
VCS / Expressway Trace Configuration
Click Stop logging after
reproducing your problem
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
83
VCS / Expressway Trace Configuration
Click to Download the log
and tcpdump (for Wireshark)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
84
Cisco Unified Border Element (CUBE)
Trace Configuration
CUBE Debugging
•
CUBE / IOS Tools:
•
•
•
•
IOS debugs
IOS show commands
Event Trace
Packet export
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
86
CUBE Debugging
•
When debugging in IOS, configure logging buffered to a fairly large value (based
on available memory)
•
Disable logging to the console with command ‘no logging console’
•
Enable timestamps for debugs
•
Make sure router has NTP enabled
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
logging buffered 10000000
no logging console
clock timezone EST -5 0
clock summer-time EDT recurring
ntp server 10.14.1.1
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
87
CUBE Debugging
Various SIP debugs available
CUBE#debug ccsip ?
all
Enable
calls
Enable
dhcp
Enable
error
Enable
events
Enable
function
Enable
info
Enable
media
Enable
messages
Enable
non-call
Enable
preauth
Enable
states
Enable
translate Enable
transport Enable
verbose
Enable
all SIP debugging traces
CCSIP SPI calls debugging trace
SIP-DHCP debugging trace
SIP error debugging trace
SIP events debugging trace
SIP function debugging trace
SIP info debugging trace
SIP media debugging trace
CCSIP SPI messages debugging trace
Non-Call-Context trace (OPTIONS, SUBSCRIBE etc)
SIP preauth debugging traces
CCSIP SPI states debugging trace
SIP translation debugging trace
SIP transport debugging traces
verbose mode
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
88
CUBE Debugging
Sample ‘debug ccsip messages’
Jan 12 03:14:43.102: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received:
INVITE sip:+19193922900@10.14.1.10:5060 SIP/2.0
Via: SIP/2.0/TCP 172.18.106.59:5060;branch=z9hG4bK978d2e8df73dc
From: "Paul Giralt" <sip:89915644@172.18.106.59>;tag=16218435~-b82e2c213ca7-45552048
To: <sip:+19193922900@10.14.1.10>
Date: Thu, 12 Jan 2012 03:09:42 GMT
Call-ID: ddc4e480-f0e14ef6-94ca5c-3b6a12ac@172.18.106.59
Supported: 100rel,timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM10.5
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 3720668288-0000065536-0000015564-0996807340
Session-Expires: 1800
P-Asserted-Identity: "Paul Giralt" <sip:89915644@172.18.106.59>
Remote-Party-ID: "Paul Giralt" <sip:89915644@172.18.106.59>;party=calling;screen=yes;privacy=off
Contact: <sip:89915644@172.18.106.59:5060;transport=tcp>;video;audio
Max-Forwards: 69
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
89
CUBE Debugging
•
Other generic voice debugs can be useful as well:
•
debug voice ccapi inout
• debug voice dialpeer
• debug voice rtp session dtmf-relay
• debug voice rtp session named-event (for any RFC 4933/2833 packets)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
90
Cisco Unified Border Element Basic Call Flow
•
Incoming VoIP setup message from originating endpoint
•
This matches inbound VoIP dial peer 1 for characteristics such as codec, VAD, DTMF
method, protocol, etc.
•
Match the called number to outbound VoIP dial peer 2
•
Outgoing VoIP setup message
voice service voip
allow-connections sip to sip
Originating
Endpoint
Terminating
Endpoint
Incoming VoIP Call
Outgoing VoIP Call
CUBE
dial-peer voice 1 voip
destination-pattern 1000
incoming called-number .T
session protocol sipv2
session target ipv4:192.168.10.50
dtmf-relay rtp-nte sip-kpml
codec g711ulaw
dial-peer voice 2 voip
destination-pattern 2000
session protocol sipv2
session target ipv4:192.168.12.25
voice-class sip early-offer forced
dtmf-relay rtp-nte
codec g711ulaw
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
91
CUBE show Commands
•
show call active voice [brief] shows state of currently active calls
0
: 2807 92135710ms.1 (23:55:20.115 EST Mon Jan 16 2016) +1770 pid:1 Answer 89915644 active
dur 00:00:14 tx:743/14860 rx:718/14360 dscp:0 media:0 audio tos:0xB8 video tos:0x0
IP 10.116.101.41:23412 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g729r8 TextRelay: off
media inactive detected:n media contrl rcvd:n/a timestamp:n/a
long duration call detected:n long duration call duration:n/a timestamp:n/a
0
: 2808 92135720ms.1 (23:55:20.125 EST Mon Jan 16 2016) +1750 pid:100 Originate 9193922900 active
dur 00:00:14 tx:718/14360 rx:755/15100 dscp:0 media:0 audio tos:0xB8 video tos:0x0
IP 172.30.206.164:10076 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g729r8 TextRelay: off
media inactive detected:n media contrl rcvd:n/a timestamp:n/a
long duration call detected:n long duration call duration:n/a timestamp:n/a
Telephony call-legs: 0
SIP call-legs: 2
H323 call-legs: 0
Call agent controlled call-legs: 0
SCCP call-legs: 0
Multicast call-legs: 0
Total call-legs: 2
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
92
CUBE show Commands
•
show cube calls shows more specific CUBE-related call information and allows filtering
CUBE# show cube calls all ?
callID
Display information matches callID
called-number
Display information matches called number
calling-number Display information matches calling number
conf-id
Display information matches conference ID
detail
Display detail level information
fpi-cor
Display information matches FPI Correlator
peer-callID
Display information matches peer callID
peer-rtp-port
Display information matches peer rtp-port number
rtp-port
Display information matches rtp-port number
|
Output modifiers
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
93
CUBE show Commands
CUBE#show cube calls all called-number 8008001180
called number: 8008001180 info are as the following:
=============================================================
=============================================================
Phone number 8008001180 has the following callID associated to it:
=============================================================
CallID: 1730781, calling number: 9195551234
============================================================
A total of 1 call legs associated to number: 8008001180
============================================================
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
94
CUBE show Commands
CUBE#show cube calls all callID 1730781
callid: 1730781 info are as the following:
=============================================================
SIP call leg info:
=============================================================
SIP CALL INFO of CCAPI callid 1730781
Call 1
SIP Call ID
: 41669A03-D5611E5-8A6384B0-5DED4CDB@64.102.250.104
State of the call
: STATE_ACTIVE (7)
Substate of the call
: SUBSTATE_NONE (0)
Calling Number
: 9195551234
Called Number
: 8008001180
Called URI
: sip:8008001180@208.70.21.21:5060
Bit Flags
: 0xE04018 0x90000100 0x0
CC Call ID
: 1730781
Source IP Address (Sig ): 64.102.250.104
Destn SIP Req Addr:Port : [208.70.21.21]:5060
Destn SIP Resp Addr:Port: [208.70.21.21]:5060
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
95
CUBE SIP Event Trace
•
All events related to a call are put into buffers
•
Can search for calls based on calling number, called number, or call ID
•
Buffers can be automatically dumped to an FTP/TFTP server when calls end
•
Available on CUBE(Ent) ASR release XE3.10 and later
•
Available on CUBE(Ent) ISR release 15.3(3)M and later
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
96
Reference
CUBE SIP Event Trace
1.
Define events to be traced
CUBE(config)# monitor event-trace voip ccsip msg size 50
2.
Enable event trace (will enable automatically on a reload)
CUBE# monitor event-trace voip ccsip msg ?
clear
Clear the trace
disable Disable tracing
dump
Dumps the event buffer into a file
enable
Enable tracing
3. Configure automatic file uploads (optional)
CUBE(config)# monitor event-trace voip ccsip dump-file ftp://user:password@<ipaddr>/path/cube.txt
CUBE(config)# monitor event-trace voip ccsip dump all
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
97
Reference
CUBE SIP Event Trace
Viewing event trace information
CUBE# monitor event-trace voip ccsip [msg | history] dump filter ? [pretty]
call-id
Filter traces based on Internal Call Id
called-num
Filter traces based on Called Number
calling-num Filter traces based on Calling Number
sip-call-id Filter traces based on SIP Call Id
CUBE# show monitor event-trace voip ccsip [msg | history] ?
all
Show all the traces in current buffer
back
Show trace from this far back in the past
clock
Show trace from a specific clock time/date
filter
Show Trace filter Options
from-boot Show trace from this many seconds after booting
latest
Show latest trace events since last display
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
98
Reference
CUBE SIP Event Trace
Viewing event trace information
CUBE# show monitor event-trace voip ccsip history filter calling-num 9195551234 latest
--------Cover buff---------buffer-id = 2828
ccCallId = 305319
PeerCallId = 305320
Called-Number = +18045553456
Calling-Number = 9195551234 Sip-Call-Id =
20842180-2e012f98-167c899-3b6a12ac@172.18.106.59
sip_msgs: Enabled.. Total Traces logged = 18
---------------------------------------Cover buff---------buffer-id = 2829
ccCallId = 305320
PeerCallId = 305319
Called-Number = 8045553456 Calling-Number = 9195551234 Sip-Call-Id = BC182C1182D611E3-BAACD07D-93FD9A72@64.102.250.104
sip_msgs: Enabled.. Total Traces logged = 12
--------------------------------
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
99
Reference
CUBE – IP Traffic Capture
Export Packet Data in PCAP Format

IP Traffic Export feature allows export of packets on an interface

Configuration:
ip traffic-export profile CUBE_Debug mode capture
bidirectional
incoming access-list 101
outgoing access-list 101
interface GigabitEthernet0/0
ip traffic-export apply CUBE_Debug size 10000000
•
Usage:
traffic-export interface g0/0 start
traffic-export interface g0/0 stop
traffic-export interface g0/0 copy scp://10.1.1.1/capture.pcap
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
100
Case Studies
Case Study 1: Unable to Place a Call
Problem Description
•
A user reports that every time they call (919) 555-1212, they get a message that
the call could not be completed as dialed
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
102
Case Study 1: Unable to Place a Call
Use RTMT Session Trace
•
Enter *5551212 into Called Number/URI field
•
Set time and duration appropriately
•
Search Finds two calls
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
103
Case Study 1: Unable to Place a Call
Use RTMT Session Trace
•
Double-click to see
message diagram
•
Clearly shows the farend sends back a
404 Not Found
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
104
Case Study 1: Unable to Place a Call
Troubleshoot Call on CUBE
• Enable SIP message debugs – debug ccsip messages
Jan 16 04:00:22.679: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received:
INVITE sip:+19195551212@10.14.1.10:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bKb5291d44b969a4
From: "Paul Giralt" <sip:89915644@172.18.106.59>;tag=19210128~0d0d25d7-4931-4a07-83c6-b82e2c213ca7-45568313
To: <sip:+19195551212@10.14.1.10>
Date: Mon, 16 Jan 2018 03:55:17 GMT
Call-ID: e59bc600-f1319fa5-b1ea4a-3b6a12ac@172.18.106.59
Supported: timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM12.0
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 3852191232-0000065536-0000018595-0996807340
Session-Expires: 1800
P-Asserted-Identity: "Paul Giralt" <sip:89915644@172.18.106.59>
Contact: <sip:89915644@172.18.106.59:5060>
Max-Forwards: 69
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
105
Case Study 1: Unable to Place a Call
Troubleshoot Call on CUBE
•
Check to see if the number matches a valid dial peer
Jan 16 04:00:22.687: //98/E59BC6000000/SIP/Msg/ccsipDisplayMsg:
Sent:
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bKb5291d44b969a4
From: "Paul Giralt" <sip:89915644@172.18.106.59>;tag=19210128~0d0d25d7-4931-4a07-83c6 b82e2c213ca7-45568313
To: <sip:+19195551212@10.14.1.10>;tag=253488-726
Date: Mon, 16 Jan 2018 04:00:22 GMT
Call-ID: e59bc600-f1319fa5-b1ea4a-3b6a12ac@172.18.106.59
CSeq: 101 INVITE
Allow-Events: telephone-event
Server: Cisco-SIPGateway/IOS-15.6.2.T
Reason: Q.850;cause=1
Content-Length: 0
CUBE#show dialplan number +19195551212
Macro Exp.: +19195551212
No match, result=-1
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
106
Case Study 2: Unable to Place a Call #2
Problem Description
•
A user reports that every time they call 80010001, they get reorder (fast busy)
tone
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
107
Case Study 2: Unable to Place a Call #2
Use RTMT Session Trace
• Enter *80010001 into Called Number/URI field
•
Set time and duration appropriately
•
Search Finds one call
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
108
Case Study 2: Unable to Place a Call #2
Use RTMT Session Trace
•
Trace shows
signaling from
both phone and to
destination SIP
trunk
•
Receiving a 503
Service
Unavailable from
destination
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
109
Case Study 2: Unable to Place a Call #2
SIP/2.0 503 Service Unavailable
Via: SIP/2.0/UDP 172.18.106.58:5060;branch=z9hG4bK34a0915e2c7a20
From: "Paul Giralt" <sip:89915644@172.18.106.58>;tag=5964355~0d0d25d7-49314a07-83c6-b82e2c213ca7-44286097
To: <sip:80010001@10.81.98.203>;tag=932088316
Date: Sun, 07 Jun 2015 16:02:18 GMT
Call-ID: 9126a680-57416b0a-349ed0-3a6a12ac@172.18.106.58
CSeq: 101 INVITE
Allow-Events: presence
Warning: 399 collab-ccie-cm1a "Unable to find a device handler for the request
received on port 5060 from 172.18.106.58"
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
110
Case Study 3: No One Answers the Phone
Problem Description
•
A user reports that every time they call a specific phone number, no one
answers the call, but if they call from their cell phone, the call is answered
immediately every time.
•
Calling phone is extension 89919236
•
Called number is 1 877 288-8362
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
111
Case Study 3: No One Answers the Phone
Collect Traces
• Problem is reproducible, so generate a test call and then collect traces.
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
112
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
•
Problem is reproducible, so generate a test call and then collect traces. Drag
and Drop folder into TranslatorX
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
113
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
•
Try to find call in Call List
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
114
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
•
Search for called party number
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
115
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
•
Disable Filters
•
Select the INVITE
•
Filter by SIP Call ID (control/command – S)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
116
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
03/29/2010 10:36:41.497 |//SIP/SIPUdp/wait_SdlSPISignal: Outgoing SIP UDP message to 172.18.159.231:[5060]:
INVITE sip:+18772888362@172.18.159.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK1515b3154665
From: "Test User 1" <sip:9194769236@172.18.106.59>;tag=97903bc0-a3de-4a15-ba27-44c81fe3adcd-45510543
To: <sip:+18772888362@172.18.159.231>
Date: Mon, 29 Mar 2010 14:36:41 GMT
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
Supported: timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM8.0
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 2081204224-3137452793-0000000466-0996807340
Session-Expires: 1800
P-Asserted-Identity: "Test User 1" <sip:9194769236@172.18.106.59>
Contact: <sip:9194769236@172.18.106.59:5060>;video;audio
Max-Forwards: 69
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
117
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
•
Where did the call originate? Try searching for the calling party number
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
118
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
•
Select the INVITE
•
Create New Filter (control/command-N)
•
Filter by IP Address (control/command – I)
•
Re-enable Filters
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
119
Case Study 3: No One Answers the Phone
Use TranslatorX to Analyze Traces
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
120
Case Study 3: No One Answers the Phone
INVITE from IP Phone w/ SDP
03/29/2010 10:36:33.771 |//SIP/SIPTcp/wait_SdlReadRsp: Incoming SIP TCP message from 172.18.159.152 on port 51682 index
2321 with 1717 bytes:
INVITE sip:9@172.18.106.59;user=phone SIP/2.0
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1636ab61
From: "Test User 1" <sip:89919236@172.18.106.59>;tag=00260bd9669e07147bcb3aac-3cda8f0c
To: <sip:9@172.18.106.59;user=phone>
Call-ID: 00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152
Max-Forwards: 70
Date: Mon, 29 Mar 2010 14:36:33 GMT
CSeq: 101 INVITE
User-Agent: Cisco-CP9951/9.0.1
Contact: <sip:4a8a8f91-609e-d655-19ea-44eedcd7b0d6@172.18.159.152:51682;transport=tls>
Expires: 180
Accept: application/sdp
Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE,INFO
Remote-Party-ID: "Test User 1" <sip:89919236@172.18.106.59>;party=calling;id-type=subscriber;privacy=off;screen=yes
Supported: replaces,join,sdp-anat,norefersub,extended-refer,X-cisco-callinfo,X-cisco-serviceuri,X-cisco-escapecodes,X-ciscoservice-control,X-cisco-srtp-fallback,X-cisco-monrec,X-cisco-config,X-cisco-sis-5.0.0,X-cisco-xsi-9.0.1
Allow-Events: kpml,dialog
Content-Length: 632
Content-Type: application/sdp
Content-Disposition: session;handling=optional
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
121
Case Study 3: No One Answers the Phone
INVITE from IP Phone w/ SDP (continued)
v=0
o=Cisco-SIPUA 26964 0 IN IP4 172.18.159.152
s=SIP Call
t=0 0
m=audio 29254 RTP/SAVP 0 8 18 102 9 116 124 101
c=IN IP4 172.18.159.152
a=crypto:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:102 L16/16000
a=rtpmap:9 G722/8000
a=rtpmap:116 iLBC/8000
a=fmtp:116 mode=20
a=rtpmap:124 ISAC/16000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
m=video 25466 RTP/AVP 97
c=IN IP4 172.18.159.152
b=TIAS:1000000
a=rtpmap:97 H264/90000
a=fmtp:97 profile-level-id=42801E
a=recvonly
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
122
Case Study 3: No One Answers the Phone
Unified CM Sends a 100 Trying
03/29/2010 10:36:33.773 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port 51682 index 2321
SIP/2.0 100 Trying
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1636ab61
From: "Test User 1" <sip:89919236@172.18.106.59>;tag=00260bd9669e07147bcb3aac-3cda8f0c
To: <sip:9@172.18.106.59;user=phone>
Date: Mon, 29 Mar 2010 14:36:33 GMT
Call-ID: 00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152
CSeq: 101 INVITE
Allow-Events: presence
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
123
Case Study 3: No One Answers the Phone
Unified CM Sends a REFER to Play Outside Dialtone
03/29/2010 10:36:33.780 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port 51682 index 2321
REFER sip:89919236@172.18.159.152:51682 SIP/2.0
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK151511c5f04bf
From: <sip:89919236@172.18.106.59>;tag=2144536187
To: <sip:89919236@172.18.159.152>
Call-ID: 7747f400-bb01baf1-14685-3b6a12ac@172.18.106.59
CSeq: 101 REFER
Max-Forwards: 70
Contact: <sip:89919236@172.18.106.59:5061;transport=tls>
User-Agent: Cisco-CUCM8.0
Expires: 0
Refer-To: cid:1234567890@172.18.106.59
Content-Id: <1234567890@172.18.106.59>
Require: norefersub
Content-Type: application/x-cisco-remotecc-request+xml
Referred-By: <sip:89919236@172.18.106.59>
Content-Length: 409
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
124
Case Study 3: No One Answers the Phone
Unified CM Sends a REFER to play Outside Dialtone (continued)
<x-cisco-remotecc-request>
<playtonereq>
<dialogid>
<callid>00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152</callid>
<localtag>97903bc0-a3de-4a15-ba27-44c81fe3adcd-45510542</localtag>
<remotetag>00260bd9669e07147bcb3aac-3cda8f0c</remotetag>
</dialogid>
<tonetype>DtOutsideDialTone</tonetype>
<direction>user</direction>
</playtonereq>
</x-cisco-remotecc-request>
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
125
Case Study 3: No One Answers the Phone
Unified CM Sends a SUBSCRIBE for KPML
03/29/2010 10:36:33.781 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port 51682 index 2321
SUBSCRIBE sip:89919236@172.18.159.152:51682 SIP/2.0
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK1515232b4e84f
From: <sip:9@172.18.106.59>;tag=1976165806
To: <sip:89919236@172.18.159.152>
Call-ID: 7747f400-bb01baf1-14686-3b6a12ac@172.18.106.59
CSeq: 101 SUBSCRIBE
Date: Mon, 29 Mar 2010 14:36:33 GMT
User-Agent: Cisco-CUCM8.0
Event: kpml; call-id=00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152; from-tag=00260bd9669e07147bcb3aac-3cda8f0c
Expires: 7200
Contact: <sip:9@172.18.106.59:5061;transport=tls>
Accept: application/kpml-response+xml
Max-Forwards: 70
Content-Type: application/kpml-request+xml
Content-Length: 424
<?xml version="1.0" encoding="UTF-8" ?>
<kpml-request xmlns="urn:ietf:params:xml:ns:kpml-request" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:ietf:params:xml:ns:kpml-request kpml-request.xsd" version="1.0">
<pattern criticaldigittimer="1000" extradigittimer="500" interdigittimer="10000" persist="persist">
<regex tag="Backspace OK">[x#*+]|bs</regex>
</pattern>
</kpml-request>
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
126
Case Study 3: No One Answers the Phone
Phone Sends 200 OK for the REFER and SUBSCRIBE
03/29/2010 10:36:33.802 |//SIP/SIPTcp/wait_SdlReadRsp: Incoming SIP TCP message from 172.18.159.152 on port 51682 index 2321 with 453 bytes:
SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK151511c5f04bf
From: <sip:89919236@172.18.106.59>;tag=2144536187
To: <sip:89919236@172.18.159.152>;tag=00260bd9669e07167c743311-343ee3af
Call-ID: 7747f400-bb01baf1-14685-3b6a12ac@172.18.106.59
Date: Mon, 29 Mar 2010 14:36:33 GMT
CSeq: 101 REFER
Server: Cisco-CP9951/9.0.1
Contact: <sip:4a8a8f91-609e-d655-19ea-44eedcd7b0d6@172.18.159.152:51682;transport=TLS>
Content-Length: 0
03/29/2010 10:36:33.843 |//SIP/SIPTcp/wait_SdlReadRsp: Incoming SIP TCP message from 172.18.159.152 on port 51682 index 2321 with 465 bytes:
SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK1515232b4e84f
From: <sip:9@172.18.106.59>;tag=1976165806
To: <sip:89919236@172.18.159.152>;tag=00260bd9669e07177ee0d51d-14f56f89
Call-ID: 7747f400-bb01baf1-14686-3b6a12ac@172.18.106.59
Date: Mon, 29 Mar 2010 14:36:33 GMT
CSeq: 101 SUBSCRIBE
Server: Cisco-CP9951/9.0.1
Contact: <sip:4a8a8f91-609e-d655-19ea-44eedcd7b0d6@172.18.159.152:51682;transport=TLS>
Expires: 7200
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
127
Case Study 3: No One Answers the Phone
IP Phone
Unified CM
CUBE
(172.18.159.152)
(172.18.106.59)
(172.18.159.231)
INVITE
100 Trying
REFER
SUBSCRIBE
200 OK (REFER)
200 OK (SUBSCRIBE)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
128
Case Study 3: No One Answers the Phone
User Dials a ‘1’
03/29/2010 10:36:34.350 |//SIP/SIPTcp/wait_SdlReadRsp: Incoming SIP TCP message from 172.18.159.152 on port 51682
index 2321 with 896 bytes:
NOTIFY sip:9@172.18.106.59:5061 SIP/2.0
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1cd529ba
To: <sip:9@172.18.106.59>;tag=1976165806
From: <sip:89919236@172.18.159.152>;tag=00260bd9669e07177ee0d51d-14f56f89
Call-ID: 7747f400-bb01baf1-14686-3b6a12ac@172.18.106.59
Date: Mon, 29 Mar 2010 14:36:33 GMT
CSeq: 1001 NOTIFY
Event: kpml
Subscription-State: active; expires=7200
Max-Forwards: 70
Contact: <sip:4a8a8f91-609e-d655-19ea-44eedcd7b0d6@172.18.159.152:51682;transport=TLS>
Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE
Content-Length: 209
Content-Type: application/kpml-response+xml
Content-Disposition: session;handling=required
<?xml version="1.0" encoding="UTF-8"?>
<kpml-response xmlns="urn:ietf:params:xml:ns:kpml-response" version="1.0" code="200" text="OK" suppressed="false"
forced_flush="false" digits="1" tag="Backspace OK"/>
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
129
Case Study 3: No One Answers the Phone
Unified CM Replies to NOTIFY With a 200 OK
03/29/2010 10:36:34.352 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port 51682 index
2321
SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1cd529ba
From: <sip:89919236@172.18.159.152>;tag=00260bd9669e07177ee0d51d-14f56f89
To: <sip:9@172.18.106.59>;tag=1976165806
Date: Mon, 29 Mar 2010 14:36:34 GMT
Call-ID: 7747f400-bb01baf1-14686-3b6a12ac@172.18.106.59
CSeq: 1001 NOTIFY
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
130
Case Study 3: No One Answers the Phone
Unified CM Replies Sends a REFER to Disable Outside Dialtone
03/29/2010 10:36:34.353 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port 51682
REFER sip:89919236@172.18.159.152:51682 SIP/2.0
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK151536ea86ab0
From: <sip:89919236@172.18.106.59>;tag=1574166193
To: <sip:89919236@172.18.159.152>
Call-ID: 77e08a80-bb01baf2-14687-3b6a12ac@172.18.106.59
CSeq: 101 REFER
Max-Forwards: 70
Contact: <sip:89919236@172.18.106.59:5061;transport=tls>
User-Agent: Cisco-CUCM8.0
Expires: 0
Refer-To: cid:1234567890@172.18.106.59
Content-Id: <1234567890@172.18.106.59>
Require: norefersub
Content-Type: application/x-cisco-remotecc-request+xml
Referred-By: <sip:89919236@172.18.106.59>
Content-Length: 401
BRKUCC-2932
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131
Case Study 3: No One Answers the Phone
<x-cisco-remotecc-request>
<playtonereq>
<dialogid>
<callid>00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152</callid>
<localtag>97903bc0-a3de-4a15-ba27-44c81fe3adcd-45510542</localtag>
<remotetag>00260bd9669e07147bcb3aac-3cda8f0c</remotetag>
</dialogid>
<tonetype>Dt_NoTone</tonetype>
<direction>user</direction>
</playtonereq>
</x-cisco-remotecc-request>
BRKUCC-2932
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132
Case Study 3: No One Answers the Phone
Phone Replies With 200 OK to REFER
03/29/2010 10:36:34.402 |//SIP/SIPTcp/wait_SdlReadRsp: Incoming SIP TCP message from 172.18.159.152 on port 51682 index
2321 with 453 bytes:
SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.18.106.59:5061;branch=z9hG4bK151536ea86ab0
From: <sip:89919236@172.18.106.59>;tag=1574166193
To: <sip:89919236@172.18.159.152>;tag=00260bd9669e07184b08b96b-796ab86f
Call-ID: 77e08a80-bb01baf2-14687-3b6a12ac@172.18.106.59
Date: Mon, 29 Mar 2010 14:36:33 GMT
CSeq: 101 REFER
Server: Cisco-CP9951/9.0.1
Contact: <sip:4a8a8f91-609e-d655-19ea-44eedcd7b0d6@172.18.159.152:51682;transport=TLS>
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
133
Case Study 3: No One Answers the Phone
IP Phone
Unified CM
CUBE
(172.18.159.152)
(172.18.106.59)
(172.18.159.231)
INVITE
100 Trying
REFER
SUBSCRIBE
200 OK (REFER)
200 OK (SUBSCRIBE)
NOTIFY
200 OK (NOTIFY)
REFER
200 OK (REFER)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
134
Case Study 3: No One Answers the Phone
User Dials a ‘8’
03/29/2010 10:36:34.944 |//SIP/SIPTcp/wait_SdlReadRsp: Incoming SIP TCP message from 172.18.159.152 on port 51682
index 2321 with 896 bytes:
NOTIFY sip:9@172.18.106.59:5061 SIP/2.0
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK647d03c1
To: <sip:9@172.18.106.59>;tag=1976165806
From: <sip:89919236@172.18.159.152>;tag=00260bd9669e07177ee0d51d-14f56f89
Call-ID: 7747f400-bb01baf1-14686-3b6a12ac@172.18.106.59
Date: Mon, 29 Mar 2010 14:36:34 GMT
CSeq: 1002 NOTIFY
Event: kpml
Subscription-State: active; expires=7195
Max-Forwards: 70
Contact: <sip:4a8a8f91-609e-d655-19ea-44eedcd7b0d6@172.18.159.152:51682;transport=TLS>
Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE
Content-Length: 209
Content-Type: application/kpml-response+xml
Content-Disposition: session;handling=required
<?xml version="1.0" encoding="UTF-8"?>
<kpml-response xmlns="urn:ietf:params:xml:ns:kpml-response" version="1.0" code="200" text="OK" suppressed="false"
forced_flush="false" digits="8" tag="Backspace OK"/>
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
135
Case Study 3: No One Answers the Phone
Unified CM Replies to NOTIFY With a 200 OK
03/29/2010 10:36:34.352 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port 51682 index
2321
SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1cd529ba
From: <sip:89919236@172.18.159.152>;tag=00260bd9669e07177ee0d51d-14f56f89
To: <sip:9@172.18.106.59>;tag=1976165806
Date: Mon, 29 Mar 2010 14:36:34 GMT
Call-ID: 7747f400-bb01baf1-14686-3b6a12ac@172.18.106.59
CSeq: 1001 NOTIFY
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
136
Case Study 3: No One Answers the Phone
User Dials Remaining Digits
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
137
Case Study 3: No One Answers the Phone
IP Phone
Unified CM
CUBE
(172.18.159.152)
(172.18.106.59)
(172.18.159.231)
INVITE
100 Trying
REFER
SUBSCRIBE
200 OK (REFER)
200 OK (SUBSCRIBE)
NOTIFY
200 OK (NOTIFY)
REFER
200 OK (REFER)
NOTIFY
200 OK (NOTIFY)
NOTIFY / 200 OK
Repeats 10 Times
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
138
Case Study 3: No One Answers the Phone
CUCM Sends an INVITE to the CUBE
03/29/2010 10:36:41.497 |//SIP/SIPUdp/wait_SdlSPISignal: Outgoing SIP UDP message to 172.18.159.231:[5060]:
INVITE sip:+18772888362@172.18.159.231:5060 SIP/2.0
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK1515b3154665
From: "Test User 1" <sip:9194769236@172.18.106.59>;tag=97903bc0-a3de-4a15-ba27-44c81fe3adcd-45510543
To: <sip:+18772888362@172.18.159.231>
Date: Mon, 29 Mar 2010 14:36:41 GMT
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
Supported: timer,resource-priority,replaces
Min-SE: 1800
User-Agent: Cisco-CUCM8.0
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Call-Info: <sip:172.18.106.59:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 2081204224-3137452793-0000000466-0996807340
Session-Expires: 1800
P-Asserted-Identity: "Test User 1" <sip:9194769236@172.18.106.59>
Contact: <sip:9194769236@172.18.106.59:5060>;video;audio
Max-Forwards: 69
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
139
Case Study 3: No One Answers the Phone
IP Phone
Unified CM
CUBE
(172.18.159.152)
(172.18.106.59)
(172.18.159.231)
INVITE
100 Trying
REFER
SUBSCRIBE
200 OK (REFER)
200 OK (SUBSCRIBE)
NOTIFY
200 OK (NOTIFY)
REFER
200 OK (REFER)
NOTIFY
200 OK (NOTIFY)
NOTIFY / 200 OK
Repeats 10 Times
SUBSCRIBE
200 OK (SUBSCRIBE)
INVITE
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
140
Case Study 3: No One Answers the Phone
CUBE Replies With a 183 Session Progress W/ SDP
03/29/2010 10:36:42.324 |//SIP/SIPUdp/wait_UdpDataInd: Incoming SIP UDP message size 1568 from 172.18.159.231:[5060]:
SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP 172.18.106.59:5060;branch=z9hG4bK1515b3154665
From: "Test User 1" <sip:9194769236@172.18.106.59>;tag=97903bc0-a3de-4a15-ba27-44c81fe3adcd-45510543
To: <sip:+18772888362@172.18.159.231>;tag=DE1EFF8-0
Date: Mon, 29 Mar 2010 14:37:23 GMT
Call-ID: 7c0ca800-bb01baf9-1468e-3b6a12ac@172.18.106.59
CSeq: 101 INVITE
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
Allow-Events: telephone-event
Remote-Party-ID: <sip:+18772888362@172.18.159.231>;party=called;screen=no;privacy=off
Contact: <sip:+18772888362@172.18.159.231:5060>
Supported: sdp-anat
Server: Cisco-SIPGateway/IOS-12.x
Content-Type: multipart/mixed;boundary=uniqueBoundary
Mime-Version: 1.0
Content-Length: 788
--uniqueBoundary
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
141
Case Study 3: No One Answers the Phone
CUBE Replies With a 183 Session Progress W/ SDP
Content-Type: application/sdp
Content-Disposition: session;handling=required
v=0
o=CiscoSystemsSIP-GW-UserAgent 0 7954 IN IP4 172.18.159.231
s=SIP Call
c=IN IP4 172.18.159.231
t=0 0
m=audio 27980 RTP/AVP 0 8 116 18 100 101
c=IN IP4 172.18.159.231
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:116 iLBC/8000
a=fmtp:116 mode=20
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:100 X-NSE/8000
a=fmtp:100 192-194
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
--uniqueBoundary
Content-Type: application/x-q931
Content-Disposition: signal;handling=optional
Content-Length: 11
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
142
Case Study 3: No One Answers the Phone
Unified CM Sends a 180 Ringing to the IP Phone
03/29/2010 10:36:42.330 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port 51682 index
2321
SIP/2.0 180 Ringing
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1636ab61
From: "Test User 1" <sip:89919236@172.18.106.59>;tag=00260bd9669e07147bcb3aac-3cda8f0c
To: <sip:9@172.18.106.59;user=phone>;tag=97903bc0-a3de-4a15-ba27-44c81fe3adcd-45510542
Date: Mon, 29 Mar 2010 14:36:33 GMT
Call-ID: 00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152
CSeq: 101 INVITE
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
Allow-Events: presence
Contact: <sip:9@172.18.106.59:5061;transport=tls>
Call-Info: <urn:x-cisco-remotecc:callinfo>; security= NotAuthenticated; orientation= to; ui-state= ringout; gci= 2-305505; callinstance= 1
Send-Info: conference
Remote-Party-ID: <sip:+18772888362@172.18.106.59>;party=called;screen=no;privacy=off
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
143
Case Study 3: No One Answers the Phone
IP Phone
Unified CM
CUBE
(172.18.159.152)
(172.18.106.59)
(172.18.159.231)
INVITE
100 Trying
REFER
SUBSCRIBE
200 OK (REFER)
200 OK (SUBSCRIBE)
NOTIFY
200 OK (NOTIFY)
REFER
200 OK (REFER)
NOTIFY
200 OK (NOTIFY)
NOTIFY / 200 OK
Repeats 10 Times
SUBSCRIBE
200 OK (SUBSCRIBE)
INVITE
100 Trying
183 Session Progress
180 Ringing
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
144
Case Study 3: No One Answers the Phone
•
Phone Keeps Ringing
•
•
Timestamps Jump from 10:36:42 to 10:37:32
No SIP Signaling for 50 seconds
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
145
Case Study 3: No One Answers the Phone
Phone Sends a CANCEL
03/29/2010 10:37:32.934 |//SIP/SIPTcp/wait_SdlReadRsp: Incoming SIP TCP message from 172.18.159.152 on
port 51682 index 2321 with 422 bytes:
CANCEL sip:9@172.18.106.59;user=phone SIP/2.0
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1636ab61
From: "Test User 1" <sip:89919236@172.18.106.59>;tag=00260bd9669e07147bcb3aac-3cda8f0c
To: <sip:9@172.18.106.59;user=phone>
Call-ID: 00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152
Max-Forwards: 70
Date: Mon, 29 Mar 2010 14:37:32 GMT
CSeq: 101 CANCEL
User-Agent: Cisco-CP9951/9.0.1
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
146
Case Study 3: No One Answers the Phone
Unified CM Sends a 200 OK for the CANCEL
03/29/2010 10:37:32.935 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to 172.18.159.152 on port
51682 index 2321
SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.18.159.152:51682;branch=z9hG4bK1636ab61
From: "Test User 1" <sip:89919236@172.18.106.59>;tag=00260bd9669e07147bcb3aac-3cda8f0c
To: <sip:9@172.18.106.59;user=phone>
Date: Mon, 29 Mar 2010 14:37:32 GMT
Call-ID: 00260bd9-669e000b-588c0c2b-2193e2a3@172.18.159.152
CSeq: 101 CANCEL
Content-Length: 0
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
147
Case Study 3: No One Answers the Phone
IP Phone
Unified CM
CUBE
(172.18.159.152)
(172.18.106.59)
(172.18.159.231)
NOTIFY
200 OK (NOTIFY)
CANCEL
200 OK (CANCEL)
CANCEL
487 Request Cancelled
200 OK (CANCEL)
487 Request Cancelled
ACK
ACK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
148
Case Study 3: No One Answers the Phone
SP SBC
Unified CM
Phone 1
SBC (CUBE)
SIP
SP
CUBE
INVITE (w/ OFFER)
INVITE (no SDP)
SBC
INVITE w/ OFFER
183 Session Progress (w/ OFFER)
183 Session Progress (w/ ANSWER)
180 Ringing (no SDP)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
149
Case Study 3: No One Answers the Phone
SP SBC
Unified CM
Phone 1
SBC (CUBE)
SIP
SP
CUBE
INVITE (w/ OFFER)
INVITE (no SDP)
INVITE w/ OFFER
183 Session Progress (w/ OFFER)
??? (w/ ANSWER)
SBC
183 Session Progress (w/ ANSWER)
??? (w/ ANSWER)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
150
Case Study 3: No One Answers the Phone
SP SBC
Unified CM
Phone 1
SBC (CUBE)
SIP
SP
CUBE
INVITE (w/ OFFER)
INVITE (no SDP)
INVITE w/ OFFER
183 Session Progress (w/ OFFER)
183 Session Progress (w/ ANSWER)
SBC
183 Session Progress (w/ ANSWER)
PRACK (w/ ANSWER)
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
151
Case Study 3: No One Answers the Phone
•
How do we get the gateway to cut through audio on the 183 Session Progress message?
•
RFC 3262: Reliability of Provisional Responses in the Session Initiation Protocol (SIP)
•
Provides a way to acknowledge the 183 Session Progress message – PRACK
•
Unified CM parameter “SIP Rel1XX Options” Disabled
•Send PRACK for all 1xx Messages
•Send PRACK if 1xx Contains SDP
cube(conf-serv-sip)#rel1xx ?
disable
Disables reliable-provisional responses
require
Requires reliable-provisional responses
supported Supports reliable-provisional responses
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
152
Case Study 3: No One Answers the Phone
Unified CM SIP Profile Configuration
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
153
Case Study 3: No One Answers the Phone
IP Phone
Unified CM
CUBE
(172.18.159.152)
(172.18.106.59)
(172.18.159.231)
INVITE
100 Trying
REFER
SUBSCRIBE
200 OK (REFER)
200 OK (SUBSCRIBE)
NOTIFY
200 OK (NOTIFY)
REFER
200 OK (REFER)
NOTIFY
200 OK (NOTIFY)
NOTIFY / 200 OK
Repeats 10 Times
SUBSCRIBE
200 OK (SUBSCRIBE)
INVITE
100 Trying
183 Session Progress
183 Session Progress
PRACK
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
154
Case Study 4: Calls to S4B Clients Fail
•
When a user dials a S4B client from a video-enabled Cisco 9951 phone, the call
fails. Call is from 58574 to 60051.
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
155
Case Study 4: Live Demo
Case Study 4: Calls to S4B Clients Fail
M = {}
function M.outbound_INVITE(msg)
local contactHeader = msg:getHeader("Contact”)
if contactHeader then
local newContactHeader = string.gsub(contactHeader, ";video;audio;video", "")
msg:modifyHeader("Contact", newContactHeader)
end
end
return M
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
157
Case Study 4: Calls to S4B Clients Fail
•
For more information:
•
Visit http://developer.cisco.com/web/sip/documentation to download the SIP
Normalization and Transparency Developer Guide
BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
158
Case Study 5: Live Demo
Cisco Spark
Questions?
Use Cisco Spark to communicate
with the speaker after the session
How
1.
Find this session in the Cisco Live Mobile App
2.
Click “Join the Discussion”
3.
Install Spark or go directly to the space
4.
Enter messages/questions in the space
cs.co/ciscolivebot#BRKUCC-2932
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public
•
Please complete your Online
Session Evaluations after each
session
•
Complete 4 Session Evaluations
& the Overall Conference
Evaluation (available from
Thursday) to receive your Cisco
Live T-shirt
•
All surveys can be completed via
the Cisco Live Mobile App or the
Communication Stations
Complete Your Online
Session Evaluation
Don’t forget: Cisco Live sessions will be available
for viewing on-demand after the event at
www.ciscolive.com/global/on-demand-library/.
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Continue Your Education
•
Demos in the Cisco campus
•
Walk-in Self-Paced Labs
•
Tech Circle
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BRKUCC-2932
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