Business-Class Router Solutions – All Telecommunication Services in One Access 4.10 Voice Call Routing VRT (Voice Routing Table) www.oneaccess-net.com contact@oneaccess-net.com v0.11 2007 Copyright © OneAccess Networks – All rights reserved VoIP: Call routing Overview Applicable to any call between any type of ports (local or voip). Any call routing is possible except VoIP -> VoIP call Implicit Routing Easy to configure : no called number configuration No number processing Routing Table Incoming call routing : optional process done for each incoming call (from VoIP network or local port) allowing number translations (calling & called numbers) and voice profile selection Outgoing call routing : for numbering plan definition (overlap or in-bloc), selection of the remote voip device if no gatekeeper, number translations (calling & called) Possibility to configure a backup route in case of outgoing call failure Possibility to modify specific ISDN Information Elements : Type of number, Numbering plan, Bearer capability Copyright © OneAccess Networks – All rights reserved 2 Call Routing Architecture (from local port) Incoming call routing (number translations) Outgoing call routing PSTN Interfaces (ISDN, analog) VoIP Network (SDP media properties) Copyright © OneAccess Networks – All rights reserved 3 Call Routing Architecture (from VoIP network) Outgoing call routing Incoming call routing (select voip profile, number translations) PSTN Interfaces (ISDN, analog) VoIP Network (SDP media properties) Copyright © OneAccess Networks – All rights reserved 4 VoIP: Call Routing Up to 200 routing rules can be configured Type of rule: incoming (initial routing when receiving the call) or outgoing (2nd step of routing) Number to be checked Called or calling number Wildcards can be used Related port (local or VoIP) Actions: Number translations, ISDN I.E. forcing Definition of backup routes The rule order is important: the rule #1 is checked first Insertion & deletion of rules by using the rule index Copyright © OneAccess Networks – All rights reserved 5 VoIP: Call Routing Routing Process for call coming from a local port 1. The incoming rules related to the local port are checked down the rule list If matching the rule (number & port), the number translations are applied The check of incoming routing rules can be processed again until the last one. This possibility allows to make several number translations on the calling and called number. 2. The outgoing rules are checked from the first one If fully matching the rule, the number translations of the rule are applied and the call is routed to the specified port (local or voip). Backup route can be configured to define alternative rules in case of failure. If partially matching the rule (e.g.: incomplete number in overlap mode), the call is not further routed and the GW waits for another digit Copyright © OneAccess Networks – All rights reserved 6 VoIP: Call Routing Routing Process for call coming from VoIP 1. The incoming rules related to voip are checked from the first one Upon a match (number only), the number translations are applied The voip port (coder profile,etc) is determined Check of routing table can be processed again until the end of the table 2. The outgoing rules are checked from the first one Outgoing rules with voip port are excluded (no voip-voip routing) Upon a full match, the number translations are applied and the call is routed to the specified port (local or voip). Backup can be configured to define alternative rules in case of failure. Upon a partial match (ex : uncomplete number in overlap mode), the routing process is fully cancelled (done again with the next digit). Copyright © OneAccess Networks – All rights reserved 7 VoIP: Call Routing Routing on local port Configuration of a port group Same number for several ports Incoming Calls are distributed with a configurable priority Possibility of call hunting automatic backup inside the port group higher priority is given to « working » ports Several numbers can be configured for each port Copyright © OneAccess Networks – All rights reserved 8 Voice Routing (1) 6. Voice routing one200(configure)>voice-routing one200(voice-route)> ? display-routes - Show voice routing table exit - Exit from command node insert - Insert VOIP voice route move - Move VOIP voice route no - no route - Set VOIP voice route test-route - Test voice routing table <cr> one200(voice-route)> Copyright © OneAccess Networks – All rights reserved 9 Voice Routing (2) one200(voice-route)>route 1 one200(conf-voice-route)> ? dial-peer - Set route dial peer exit - Exit from command node force-bearer-cap - Set force bearer capability fields force-clir - Set caller line identity request force-numplan - Set origin/destination numplan insert-calling - Set route calling insertion insert-prefix - Set route prefix insertion insert-suffix - Set route suffix insertion no - no prefix - Set route prefix(prefix [number-type][length][timer] [overlap]) prefix-type - Set route direction and type of call startup-file - Set restart equipment with the file name. suppress-prefix - Set route prefix suppression translate - Set route number translate wildcard - Set wildcard value for prefix <cr> Copyright © OneAccess Networks – All rights reserved 10 Voice Routing (3) Registration to registrar server (user=phone). E164 Prefix is mapped to a pots-group or a voip resource. To register it, <ua-sip> must be added. Corresponding prefix is used as user portion of sip uri of To/From/Contact header field To register a username instead of a E164 prefix (no user=phone), sipusername must be validated. It overrides « prefix » value for To/From/Contact header fields for register method. It overrides « prefix » value for From/Contact header fields for Invite method. Registrar ip address or domain name must be configured at the sipgateway (reg-dns-add) 401 or 407 challenge for register and/or invite method. Sipauthentication <username> <password> are provided to calculate MD5 response. Copyright © OneAccess Networks – All rights reserved 11 Voice Routing (4) authentication CLI(voice-route)>route 1 CLI(voice-route)>dial-peer pots-group 0 ua-sip CLI(voice-route)>sip-username <user portion of sip uri> CLI(voice-route)>sip-authentication [<username> <password>] CLI(voice-route)>prefix 1000 length 4 CLI(voice-route)>prefix-type outgoing called last CLI(voice-route)>exit CLI(configure)>exit Copyright © OneAccess Networks – All rights reserved 12 Voice Routing (5) one200(voice-route)>display-routes 1 - 20. all length 4 / voip 1 / mixed - called - next 2 -1000 all length 4 / pots 0 / outgoing - called - last one200>show running-config ... voice-routing route 1 dial-peer voip 1 prefix 20. length 4 prefix-type mixed called next exit route 2 dial-peer pots-group 1 ua-sip prefix 1000 length 4 prefix-type outgoing called last exit exit ... Copyright © OneAccess Networks – All rights reserved 13 Voice Routing (6) Prefix suppression 1234 Pots-group 0 12011234 VoIP 0 route 1 dial-peer pots-group 0 prefix-type outgoing called last prefix 120A. length 4 suppress-prefix 4 called wildcard A 0123 exit Copyright © OneAccess Networks – All rights reserved 14 Voice Routing (7) Codec Profile for incoming call Pots-group 0 VoIP 1 Incoming Table 986902739 VoIP 2 986911111 Pots-group 4 route 14 dial-peer voip 1 prefix 986902739 length 9 prefix-type incoming called exit route 15 dial-peer voip 2 prefix . length 0 prefix-type incoming called exit Copyright © OneAccess Networks – All rights reserved 15 Voice Routing (8) Modification of Calling and Called numbers 1/4 Calling : 019869027391111 Called : 12345678 Calling : 019869027352222 Called : 12345678 Incoming Table Calling : 986902739 Called : 120012345678 Outgoing Table Calling : 986902735 Called : 12345678 Pots-group 0 Copyright © OneAccess Networks – All rights reserved 16 Voice Routing (9) Modification of Calling and Called numbers 2/4 route 2 dial-peer pots-group 0 translate .98690273A. 98690273A calling prefix . length 0 prefix-type incoming calling next exit route 3 dial-peer pots-group 0 alias insert-prefix 1200 called prefix 986902739 length 9 prefix-type incoming calling exit alias added to register the number 1200 in the RAS Copyright © OneAccess Networks – All rights reserved 17 Voice Routing (10) Modification of Calling and Called numbers 3/4 Calling : 986902739 Called : 120012345678 Calling : 019869027391111 Called : 12345678 Incoming Table Calling : 986902739 Called : 120012345678 Outgoing Table Voip 1 Calling : 019869027352222 Called : 12345678 Calling : 986902735 Called : 12345678 Voip 0 Pots-group 0 Calling : 986902735 Called : 12345678 Copyright © OneAccess Networks – All rights reserved 18 Voice Routing (11) Modification of Calling and Called numbers 4/4 route 4 dial-peer voip 1 prefix 1200. length 4 prefix-type outgoing called last exit route 5 dial-peer voip 0 prefix . length 0 prefix-type outgoing called last exit Copyright © OneAccess Networks – All rights reserved 19 Business-Class Router Solutions – All Telecommunication Services in One Access Voice Toubleshooting & Statistics www.oneaccess-net.com contact@oneaccess-net.com v0.11 2007 Copyright © OneAccess Networks – All rights reserved Voice routing table testing One_Training(voice-route)>display-route 1 - . all length 10 / pots 0 / incoming - called - last / +prefix-calling 0 10 - . all timer / voip 0 / outgoing - called - last 20 - . all length 9 / pots 0 / outgoing - called - last / -prefix-called 1 One_Training(voice-route)> One_Training> configure terminal One_Training(configure)>voice-routing One_Training(voice-route)>test-route 0141877422 260402020 from-voip 0 --> test_route : Calling=0141877422 Called=260402020 Route match : Calling=0141877422 Called=60402020 Incoming Routes = Outgoing Routes = 20, Incoming call from voip id:0 Send towards Isdn on local port: 5/0 One_Training(voice-route)> One_Training(voice-route)> One_Training(voice-route)>test-route 260402020 0141877422 from-pots 0 --> test_route : Calling=260402020 Called=0141877422 Route match : Calling=0260402020 Called=0141877422 Incoming Routes = 1, Outgoing Routes = 10, Outgoing call from local port: 5/0 -> Send towards H323 on voip id:0 One_Training(voice-route)> Copyright © OneAccess Networks – All rights reserved 21 VoIP Statistics BRI statistics CLI# show voice voice-port bri index 0 voice port protocol descriptor current state config state layer 1 status attached vmoabri dial peer number of voice communication bri Tx frames on D channel bri Rx frames on D channel 5/0 BRI_NT activated up activated 0 0 40 41 Outgoing calls Outgoing calls failures Physical Interface down Cause Class 0 (normal event) Cause Class 1 (normal event) Normal Cause (16) : 2 User busy (17) : 3 No answer (18) : 0 Cause Class 2 (unavailable ressources) Cause Class 3 (unavailable service) Cause Class 4 (service not provided) Cause Class 5 (invalid message) Cause Class 6 (protocol error) Cause Class 7 (interworking) : : : : : 102 5 0 0 5 : : : : : : 0 0 0 0 0 0 Incoming calls Incoming calls failures Remote failure Unknown number DSP unavailable Not specified : : : : : : 54 7 0 5 0 2 Copyright © OneAccess Networks – All rights reserved 22 VoIP Statistics PRI statistics CLI# show voice voice-port pri index 0 voice port physical type protocol descriptor current state config state layer 1 status number of voice communications pri AIS occurence pri RDI occurence 5/0 E1 E1_PRI activated up deactivated 0 0 0 Outgoing calls Outgoing calls failures Physical Interface down Cause Class 0 (normal event) Cause Class 1 (normal event) Normal Cause (16) : 0 User busy (17) : 3 No answer (18) : 0 Cause Class 2 (unavailable ressources) Cause Class 3 (unavailable service) Cause Class 4 (service not provided) Cause Class 5 (invalid message) Cause Class 6 (protocol error) Cause Class 7 (interworking) : : : : : 67 3 0 0 3 : : : : : : 0 0 0 0 0 0 Incoming calls Incoming calls failures Remote failure Unknown number DSP unavailable Not specified : : : : : : 23 2 2 0 0 0 Copyright © OneAccess Networks – All rights reserved 23 VoIP Statistics FXS statistics CLI# show voice voice-port fxs index 0 voice port current state config state attached vmoa fxs dial peer voice communication Outgoing calls Outgoing calls failures User busy No answer Incoming calls Incoming calls failures Remote failure Unknown number DSP unavailable Not specified 5/0 on hook up 0 no : : : : : : : : : : 32 3 2 1 6 0 0 0 0 0 Copyright © OneAccess Networks – All rights reserved 24 VoIP Statistics Dial-peer VoIP Statistics (1) one200> show voice dial-peer voice voip type index <port id> [reset] or one200> show voice dial-peer voice voip type global[reset] type may be : -current : statistics on current calls -outgoing : outgoing calls only -incoming : incoming calls only -user-plan : voice & fax only -all (default) : all the statistics are provided Copyright © OneAccess Networks – All rights reserved 25 VoIP Statistics Dial-peer VoIP Statistics (2): Outgoing Calls Dial Peer Current Calls 1 0 Outgoing Calls Outgoing Calls Outgoing calls failures RAS Call Failures Gatekeeper Unavailable Admission Rejects H225/Q931 Call failures Cause Class 0 (normal event) Cause Class 1 (normal event) Normal Cause (16) User busy (17) No answer (18) Cause Class 2 (unavailable ressources) Cause Class 3 (unavailable service) Cause Class 4 (service not provided) Cause Class 5 (invalid message) Cause Class 6 (protocol error) Cause Class 7 (interworking) H245 Call failures Incompatible capabilities Protocol errors Internal call failures DSP unavailable Max-bandwidth exceeded Max-connection exceeded Not specified Copyright © OneAccess Networks – All rights reserved 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 26 VoIP Statistics Dial-peer VoIP Statistics (3): Incoming Calls Incoming calls Incoming calls failures RAS Call failures Gatekeeper Unavailable Admission Rejects Local Port Call failures H245 Call failures Incompatible capabilities Protocol errors Internal call failures DSP unavailable Unknown number Channel / port unavailable Max-bandwidth exceeded Max-connection exceeded Not specified Copyright © OneAccess Networks – All rights reserved 3 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 27 VoIP Statistics Dial-peer VoIP Statistics (4): Voice and Fax RTP statistics Number of transmitted packets Number of received packets Number of transmitted bytes Number of received bytes Number of excessive jitter events Number of lost packets Number of invalid packets Number of calls with frame error rate total <0.01<0.1<0.5<1<5>=5 3 0 0 2 1 Modem passthrough Number of switching to modem mode T38 FAX Calls Number of outgoing fax Number of incoming fax Number of failures Request Mode failure Pre-message procedure failure Page failure Number of transmitted packets Number of received packets Number of transmitted bytes Number of received bytes Number of lost packets Copyright © OneAccess Networks – All rights reserved 1237 1234 101484 101098 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 28 VoIP Statistics Events vxTarget>event filter manager no recover vxTarget>event add remove vxTarget>event ALL GEN VOATM VOIP vxTarget>event <subfam> <fam2> vxTarget>event - Add/remove events filters Add a SNMP manager No Recover events from memory filter - Add an event filter - Remove a events filter from the table filter add vox - All families from vox group - GEN - VOATM - VOIP filter add vox voip - <ALL | ControlPlan | UserPlan> - <GEN | VOATM> filter add vox voip all show Copyright © OneAccess Networks – All rights reserved 29 VoIP Statistics Voice call history, active calls Gives statistics on the current voice calls and the last 100 calls vxTarget>show voice voip-call any ind 1 1 - Call from remote voip: 0, to local port: 5/1 call-id: 4 active calling : 110, called : 111 setup time: 01/02/00 04h58m31s 01/02/00 04h58m31s RTP Source ip :192.168.1.110 rtp:16384 /Dest ip :192.168.1.111 rtp:16386 (active) Play time (voice) : 00h00m39s Tx Coder : G729 / 20 ms ; Rx Coder : G729 RTP Packets RX / TX : 1988 / 1989 RTP Packet lost&discarded RX / TX (RTCP reported) : 0 / 395307 Number of Excessive Jitter events : 3 Copyright © OneAccess Networks – All rights reserved 30 VoIP Statistics RTP sessions history Gives complete statistics about the 200 last RTP sessions CLI> show voice rtpcall full any ind 2 2 - 01/04/01 00h47m24s RTP 192.168.1.1:16384 – 192.168.1.111:16386 Play time (voice) : 00h00m46s Tx Coder : G729 / 20 ms ; Rx Coder : G729 VAD enabled local / remote : no / no ERL ACOM : 15 dB : 32 dB RTP Packets received (DSP / Uplink) : 2337 / 2337 lost : 0 out of sequence : 0 invalid : 0 RTP Packets transmitted (DSP / Uplink) : 2338 / 2338 lost (RTCP reported) : 0 Jitter parameter : 100 ms Number of Excessive Jitter events : 1 Copyright © OneAccess Networks – All rights reserved 31 VoIP Statistics RTP sessions history (continue) Excessive Jitter events : 2| 1| * ---------------------------------------0 30" 1' 2' 4' 8' 12' >16' Jitter received (uplink) : Max delay : 93 ms Delays (ms) >50 >100 >150 Nb of occur. 2 0 0 Interarrival max jitter : 9 ms Jitter received (DSP) : Max delay : 93 ms Delays (ms) >50 >100 >150 Nb of occur. 2 0 0 Interarrival max jitter : 9 ms >200 0 >300 0 >200 0 >300 0 >200 0 >300 0 Frames with a delay >50 ms : 2| 1| * * ---------------------------------------0 30" 1' 2' 4' 8' 12' >16' Jitter transmitted (uplink) : Max delay : 6 ms Delays (ms) >50 >100 >150 Nb of occur. 0 0 0 Interarrival max jitter : 1 ms (RTCP reported) : 2 ms Copyright © OneAccess Networks – All rights reserved 32 VoIP: Internal Call Generator Possibility to generate and / or terminate one or several VoIP calls Two services: RTP loopback or BERT testing Use of virtual and routable dial-peer pots dial-peer voice pots 4 service bert2047 both 3 pots-group 0 exit voip-call 1 pots 4 called 0198723000 calling 3000 bearer data duration 180 timeout 10 exit One200> start identifier 1 Copyright © OneAccess Networks – All rights reserved 33 VoIP: ISDN capture Possibility to capture the signalling traffic over ISDN BRI & PRI interfaces: layer 1 to 3 For VoIP side: use of the IP capture possibilities CLI>conf t CLI>logging buffered debug CLI>exit CLI>debug isdn all layer 1to3 00:07:21.271 00:07:21.271 00:07:21.271 00:07:21.271 00:07:21.271 00:07:21.272 00:07:21.343 00:07:21.343 00:07:21.343 00:07:21.343 00:07:21.343 00:07:21.343 line:5/0 L1 frame sent. line:5/0 L2 tx UI P/F=0 NR=4 NS=2 C/R=1. hex: 02 ff 03 line:5/0 L3 tx SETUP callref:8. hex1: 08 01 08 05 04 03 80 90 a3 18 01 89 70 04 a1 31 hex2: 31 31 a1 line:5/0 L1 frame received. line:5/0 L2 rx SABME P/F=1 C/R=0. hex: 00 01 7f line:5/0 L1 frame sent. line:5/0 L2 tx UA P/F=1 NR=4 NS=2 C/R=0. hex: 00 01 73 Copyright © OneAccess Networks – All rights reserved 34 Call factory over IP For debug, a SETUP can be sent on VoIP. One_training>auto-call <called> - called number: up to 21 characters <0..9, #, *> One_training>auto-call 0141877422 <calling> - calling number: up to 21 characters <0..9, #, *> <pots-number> - pots: 0..29 <bearer> - bearer capability < voice | data | voiceband > overlap - units in milliseconds: 0..2000 <0 means no overlap used> <cr> One_training>auto-call 0141877422 2408882005 17:50:17.677 Info vox factory test 1 call-id: 4, ident: auto-call, CALL IN PROGRESS Calling=2408882 005 Called=0141877422. one100_interopBW>17:50:17.678 Info vox voip controlplan 3 Incoming call on local pots: 0, calling: 2408882005, called: 0141877422, call-id: 4. 17:50:17.710 Info vox voip controlplan 3 Outgoing call on voip id: 0, calling: 2408882005, called: 0141877422, call-id: 4. 17:50:27.660 Info vox factory test 1 call-id: 4, ident: auto-call, CALL FAILED cause=no codec. 17:50:27.661 Info vox factory test 1 call-id: 4, ident: auto-call, CALL FAILED on pots cause=[Norma l call clearing]. Copyright © OneAccess Networks – All rights reserved 35 Auto call to ISDN For debug, a ‘SETUP’ can be sent on a ISDN local port. One_training>isdn test call 85841 ( data call/unrestricted ) 02:27:34.914 line:5/0 L1 event received PH_AR State:F3. 02:27:34.923 line:5/0 L1 event received EV_LOST_FRAMING State:F4. 02:27:34.923 line:5/0 L1 event received EV_INFO_2 State:F5. 02:27:34.925 line:5/0 L1 event received EV_INFO_4_8(PH_AI) State:F6. 02:27:34.925 line:5/0 L1 event received MPH_AI State:F7. 02:27:34.925 line:5/0 L1 frame sent. 02:27:34.925 line:5/0 L2 tx SABME P/F=1 C/R=0. 02:27:34.925 hex: 00 83 7f 02:27:34.938 line:5/0 L1 frame received. 02:27:34.938 line:5/0 L2 rx UA P/F=1 C/R=0. 02:27:34.939 hex: 00 83 73 02:27:34.939 line:5/0 L1 frame sent. 02:27:34.940 line:5/0 L2 tx INFO P=0 NR=0 NS=0 C/R=0. 02:27:34.940 hex: 00 83 00 00 02:27:34.940 line:5/0 L3 tx SETUP callref:4. 02:27:34.940 hex1: 08 01 04 05 04 02 88 90 18 01 83 70 06 81 38 35 02:27:34.940 hex2: 38 34 31 a1 02:27:34.940 Called Number : 85841 Copyright © OneAccess Networks – All rights reserved 36 Fax relay T38 debug Fax T38 processing and traces: display of the T30 messages. One_training>trace filter add vox up ifp 2 show 01:42:38.100 Info vox voip controlplan 3 Outgoing call on voip id: 0, calling: 110, called: 111, call-id: 29. 01:42:40.397 Info vox voip controlplan 3 Alert in band received, call-id: 29. 01:42:40.917 Info vox voip userplan 3 VoIP RTP transmission started, coder: G729, call-id: 29. 01:42:40.997 Info vox voip userplan 3 VoIP RTP reception started, coder: G729, call-id: 29. 01:42:52.444 Info vox voip controlplan 3 Call connected, call-id: 29. 01:42:57.537 Info vox voip userplan 3 VoIP RTP transmission stopped, coder: G729, call-id: 29. 01:42:57.537 Info vox voip userplan 3 VoIP RTP reception stopped, coder: G729, call-id: 29. 01:42:57.665 Info vox voip userplan 3 Fax T38 starting call-id: 29 . 01:43:04.825 VOX.up.ifp.2 ------ NSF / CSI / DIS ------> 01:43:07.717 VOX.up.ifp.2 <-------- TSI / DCS ---------01:43:07.837 VOX.up.ifp.2 <------- TCF (v29_9600) -------01:43:11.814 Info vox voip userplan 1 T38 Pre-message procedure OK, call-id: 29. 01:43:11.814 VOX.up.ifp.2 ------------ CFR ------------> 01:43:12.437 Info vox voip userplan 1 T38 Transmitting page 1, call-id: 29. 01:43:12.437 VOX.up.ifp.2 <------ PAGE (v29_9600) -------01:51:10.502 VOX.up.ifp.2 <--------- PPS-EOP ----------01:51:13.599 Info vox voip userplan 1 T38 page 1 OK, call-id: 29. 01:51:13.599 VOX.up.ifp.2 ------------ MCF ------------> 01:51:15.282 VOX.up.ifp.2 <----------- DCN ------------01:51:15.846 Info vox voip controlplan 3 Call Disconnection received on local port: 5/2, cause: (16)[Normal call clearing], call-id: 29. Copyright © OneAccess Networks – All rights reserved 37 Modem / fax pass-through event Example of event in case of modem/fax call. One_training>event filter add vox all show 00:11:21.485 Info vox voip controlplan 3 Incoming call on voip id: 0, calling: 111, called: 110, call-id: 3. 00:11:21.486 Info vox voip controlplan 3 Outgoing call on local port: 5/0, calling: 111, called: 110, call-id:3. 00:11:21.550 Info vox voip controlplan 3 Alert received, call-id: 3. 00:11:21.631 Info vox voip controlplan 3 Call connected, call-id: 3. 00:11:25.142 Info vox voip userplan 1 Fax/Modem Passthrough starting call-id: 3. 00:11:25.142 Info vox voip userplan 3 RTP new transmission coder: G711 A Law, call-id: 3. 00:11:25.341 Info vox voip userplan 3 RTP new reception coder: G711 A Law, call-id: 3. 00:12:23.533 Info vox voip controlplan 3 Call Disconnection received on local port: 5/1, cause: (16)[Normal call clearing], call-id: 3. 00:12:23.552 Info vox voip userplan 3 VoIP RTP transmission stopped, coder: G711 A Law, call-id: 3. 00:12:23.552 Info vox voip userplan 3 VoIP RTP reception stopped, coder: G711 A Law, call-id: 3. Copyright © OneAccess Networks – All rights reserved 38