ITU-T Kaleidoscope 2010
Beyond the Internet? - Innovations for
future networks and services
SIP Trunking
The route to the new VoIP
Services
Ivan Gaboli, Virgilio Puglia
Italtel SpA
Ivan.Gaboli@ italtel.it
Virgilio.Puglia@italtel.it
Pune, India, 13 – 15 December 2010
SIP Business Trunking Architectural
Model
AS
AS
Class 5
Softswitch
NGN
SIP-I
ISUP
PSTN/PLMN
Media
SIP
Network Border Elements
Public Domain
Private Domain
Customer Border Elements
Customer Border Elements
AS
CN
IP-PBX
IP-PBX
IP-PBX
Very Large Enterprise
Medium/Large Enterprise
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Network Elements
Public Domain
Applications Servers
Class 5 Softswitch
Media Gateways
Network Border Element
Private Domain
Corporate Border Element
Corporate Switching Node
Application servers
IP PBXs
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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New world of services
Mobile Enterprise
Mobile office
User ubiquity
Any-Device, Any-Time, Any-Where
Unified communication & collaboration
Unified messaging
Telepresence
Document sharing
Virtual meeting rooms
Web 2.0
Social Media Networks
Presence Federation
Co-opetition & Mass creativity
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Innovation Fields
Security
Secured channels
Data confidentiality
Network reliability
Governance
Simplified network management
Managed services
Easy customization
High performance
User autonomy (Self-Care portals)
Sustainability
Virtualization
Ecology
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Basic Call Setup Flow
Private Domain
Custom
IP Phone
ICT
CSN
IPPBX
CSN
Public Domain
SIP
SIP
BE
SIP
BE
H.248
SSW-C5
ISUP
MGW
PSTN
Phone Control
INVITE (no SDP)
SETUP
Ringing (180)
RTP
RTP
RTP (Ring Back Tone)
Answer
Answer (200 OK)
RTP
RTP
RTP
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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SIP Business Trunking – Signaling
Model
ISDN Like
Signaling is decoupled by IP-PBX and Media is
anchored by the IP-PBX using a Media
Termination Function to emulate a PBX
behaviour
Pure SIP
Signaling goes peer-to-peer between IP-PBXs
Hierarchic
Signaling between IP-PBXs is manipulated by a
centralized harmonization function (HF) that
can also anchor the media
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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SIP Business Trunking – Signaling
Model
Class 5
Softswitch
Class 5
Softswitch
Class 5
Softswitch
HF
IP-PBX
IP-PBX
MTP
IP-PBX
IP-PBX
IP-PBX
IP-PBX
MTP
ISDN-Like
Pure SIP
Hierarchic
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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SIP Business Trunking - User Plane
Models
Fixed Media  RTP is anchored by IP-PBX
The core network it is not affected by media
changing related to services invocation
IP-PBX needs a Media Termination Function to
perform media anchoration
Variable Media  RTP is peer-to-peer
The core network must manage all the RTP
negotiatons due to user services invocation
IP-PBX can implement various type of services
and use several types of codecs
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
9
Pure SIP Model – Service invocation
IP Phone
IP-PBX
SBC
SSW
SBC
IP-PBX
IP-Phone
Trunking
Gateway
INVITE – 200 OK
RTP (Voice)
Hold / Media Channel Renegotiation
RTP (Musid on Hole)
Call Transfer (REFER)
RTP
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Go to market approach
Full Jacket
Pre-packaged solution
Low customization
High reusability
Customer Tailored
High customer requirements compliancy
High customization possibility
High costs for deployment and
certification
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Services Enabler Features
To implement New Services the network
must leverage the following capabilities:
Identity management & certification
Voice-Video codec/rating adaptation
Signaling harmonization
Security & Encryption capabilities
Management of specific peculiarities
Accounting capabilities
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Services Enabler Device
IDAD  Inter-Domain Adaptation Device
Interdomain features harmonization
Signaling decoupling & normalization
Media Anchoring
Dynamic Audio/Video transcoding/Transrating
Session Admission Control
Fax adaptation
DTMF interworking
Encryption termination
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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IDAD Media Anchoring
Media Anchoring
No Media Anchoring
Class 5
Softswitch
Class 5
Softswitch
IDAD
BE
BE
BE
BE
IP-PBX
IP-PBX
Enterprise A
BE
Enterprise B
BE
IP-PBX
IP-PBX
Enterprise A
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
Enterprise B
14
Interdomain features harmonization
IP Phone
SBC
IP-PBX
INVITE
SSW
IP Phone B
Trunking
Gateway
INVITE
200 OK
200 OK
RTP IP Phone B
IP-PBX
SBC
RTP IP Phone
HOLD
RTP Hold Tone
RTP Hold Tone
TRANSFER
RTP Trunking Gateway
RTP
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Network Semplification
A measure of complexity can be assessed
in proportion to the possible combination of
all the devices involved.
When a new domain is added, the
complexity with IDAD is significantly minor
than without:
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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SIP Business Trunk Benefits
Fast provisioning
High performance & reliability
Governance
Cost savings
Replacement of local telephone connections with VoIP
gateways
Reduction in IT operating costs
Growth
More efficient communications platforms
Improved services
Smart migration
Acceleration of communications processes for greater efficency
Support for community and semi-formal teams
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Lesson learned
Facts
SIP Trunking will permit creation of new
services for VoIP business market
Standardization facilitates interoperability
Manufacturers extend standards with
proprietary customization to provide new
services
IDAD is the trade-off between time to market
and standardization.
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Back Up Slide
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Basic Call Setup Flow
Private Domain
Custom
Public Domain
ICT
CSN
IPPBX
IP Phone
SIP
SIP
CSN
BE
SIP
H.248
BE
SSW-C5
ISUP
MGW
PSTN
Skinny
ICT
1. INVITE (no SDP)
2. 100 Trying
3. INVITE (no SDP)
4. 100 Trying
5. INVITE (no SDP)
6. 100 Trying
7. IAM
8. ACM
13. 180 ringing
(g729, sendrcv)
ICT
12. 180 ringing
(g729, sendrcv)
9. CRCX
(g711, g729, T.38)
10. OK (g729)
11. 180 ringing
(g729, sendrcv)
Skinny
14. PRACK
(g729)
19. 200 OK
ICT
RTP
15. PRACK
(g729)
18. 200 OK
RTP
16. PRACK
(g729)
17. 200 OK
RTP (Ring Back Tone)
15. ANM
20. 200 OK (g729)
21. 200 OK (g729)
ICT
22. 200 OK (g729)
Skinny
23. ACK (g729)
RTP
24. ACK (g729)
RTP
25. ACK (g729)
RTP
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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Pure SIP Model – Service invocation
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
21
Hierarchic Model - Service Invocation
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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ITU Standardization vs IDAD
The strengthening of the standards is the main way to
go forward for multi-vendor interoperable solutions,
but it’s a must also consider the presence of several
small/medium players that perform customization to
provide services.
IDAD is the trade-off between time to market and
standardization.
Pune, India, 13 – 15 Dec 2010:
ITU-T Kaleidoscope 2010 – Beyond the Internet? Innovations for future networks and services
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