SIP TRUNKING – THE ROUTE TO NEW SERVICES
Ivan Gaboli – Virgilio Puglia
AS
AS
MAIN NETWORK ELEMENTS
NGN
SIP-I
Class 5
Softswitch
ISUP
IP Phone
PSTN/PLMN
Public Domain
• Applications Servers
• Class 5 Softwitches
• Media Gateways
• Network Border Elements
SBC
IP-PBX
INVITE
SSW
IP-PBX
SBC
IP Phone B
INVITE
Media
200 OK
200 OK
SIP
RTP IP Phone B
Network Border Elements
RTP IP Phone
Public Domain
HOLD
Private Domain
Private Domain
• Corporate Border Elements
• Corporate Switching Node
• Application Servers
• IP PBXs
RTP Hold Tone
Customer Border Elements
Customer Border Elements
RTP Hold Tone
TRANSFER
AS
CSN
IP-PBX
IP-PBX
RTP Trunking Gateway
RTP
IP-PBX
Trunking
Gateway
Inter-Domain Adaptation Device (IDAD)
• Interdomain features harmonization
• Signaling decoupling & normalization
• Media Anchoring
• Audio-Video transcoding/transrating
• Session Admission Control
• Fax Adaptation
• DTMF interworking
• Authentication & accounting
• Encryption termination
Medium/Large Enterprise
Very Large Enterprise
SIP Trunking
Key Factors
SIGNALING MODELS
Class 5
Softswitch
• ISDN Like
• Pure SIP
• Hierarchic
Class 5
Softswitch
SIP BUSINESS TRUNK
Class 5
Softswitch
HF
STANDARDS
“SIP Trunking”
MEDIA MODELS
• Fixed Media
• Variable Media
IP-PBX
IP-PBX
IP-PBX
MTP
IP-PBX
IP-PBX
IP-PBX
IDAD
MTP
New services for end-users
OPEX reduction for SP
Pure SIP
ISDN-Like
• New Services
• Flexibility
• Reliability
• Easy management
• Cost reduction
• Smooth migration
• Easy Least Cost Routing
• Enabling remote workers
• Security
• Fast provisioning
Hierarchic
“END TO END” IMPACT OF A PURE SIP MODEL
SIP BUSINESS TRUNK OPENS A NEW WORLD OF SERVICES
Mobile Enterprise
Unified Communications
 Mobile Office
 Unified messaging
 User Ubiquity
 Telepresence
 Any-Device, Any-Time, Any-Where
 Multichannel video-conference
SIP
Business
Trunking
Governance & Security
Web & Sustainability
 Managed Services
 Easy customization
 Identity Access Management
 Social Media Networks
 Presence Federations
 Virtualization
BUT COMPLEXITY MAY GROW INCREASING COSTS
Private Domain
Custom
Public Domain
ICT
CSN
IPPBX
IP Phone
Skinny
CSN
ICT
SIP
SIP
BE
SIP
H.248
BE
SSW-C5
MGW
PSTN
1. INVITE (no SDP)
2. 100 Trying
3. INVITE (no SDP)
4. 100 Trying
5. INVITE (no SDP)
6. 100 Trying
Skinny
HIERACHIC MODEL WITH HARMONIZATION FUNCTION SEMPLIFIES INTERWORKING
ISUP
13. 180 ringing
(g729, sendrcv)
ICT
14. PRACK
(g729)
19. 200 OK
ICT
RTP
12. 180 ringing
(g729, sendrcv)
15. PRACK
(g729)
18. 200 OK
RTP
7. IAM
8. ACM
9. CRCX
(g711, g729, T.38)
10. OK (g729)
11. 180 ringing
(g729, sendrcv)
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
JUST A SEMPLIFIED CALL SETUP SCHEME
SERVICE PROVIDERS CAN CHOOSE DIFFERENT “GO TO MARKET” APPROACHES:
LESSON LEARNED
FULL JACKET
Pre-packaged solution with low customization and high reusability
CUSTOMER TAILORED
SIP Trunking will permit creation of new services for VoIP business market.
High customer requirement compliancy
Standardization facilitates interoperability.
High customization possibility
Manufacturers extend standards with proprietary customization to provide new services.
High costs for deployment and solution certification
A Hierarchic Model with an Harmonization Function like IDAD is the winner trade-off between
time to market and standardization.
ITU-T KALEIDOSCOPE EVENT – PUNE – INDIA – 13-15 Dec 2010