1. Vemuri, Zimmerer,1 Carrier Use of SIP Aparna Vemuri Voice Engineering Architect Level 3 Communications Eric Zimmerer Director of Product Management ipVerse Inc.

2. Vemuri, Zimmerer,2 Network Architecture Enterprise SS7 Network Trunking Gateway Softswitch IP/ATM Network Trunking Gateway SS7 Network Home/SOHO Softswitch SIP BCP-T RTP MGCP Circuit Switch Circuit Switch

3. Vemuri, Zimmerer,3 Network Architecture  SIP with additions = Softswitch to Softswitch  Open Standards (SIP BCP-T)  Isolate legacy signaling and Maintain backward compatibility  Enable scalable deployment of Softswitch network

4. Vemuri, Zimmerer,4 SIP BCP-T  SIP: Session Initiation Protocol RFC 2543  INFO Method  ISUP MIME Type  ISUP – SIP Mapping  NAP Architecture

5. Vemuri, Zimmerer,5 SIP Session Initiation Protocol  IETF Standards track: RFC 2543  Simple: Set up and tear down sessions  Wide acceptance  Stack commercially available

6. Vemuri, Zimmerer,6 INFO method  Session initiation and teardown is not enough  Mid-Call events  More complex services enabled

7. Vemuri, Zimmerer,7 ISUP MIME Type  Standard method of encapsulating legacy signaling  Simplifies Inter-working: Local variant Interconnect variant (LCD)  Specific target: do one thing well

8. Vemuri, Zimmerer,8 Why not use ISUP?  Which ISUP?  Build Tomorrow’s network with Yesterday’s protocol?  SIP BCP-T isolates legacy signaling problems  New services develop faster with IP protocols

9. Vemuri, Zimmerer,9 ISUP SIP mapping  Use SIP as a basic function or tool  Build applications that use SIP for call setup  Remember: SIP is not ISUP

10. Vemuri, Zimmerer,10 NAP architecture  Interconnect Packet Networks Circuit to packet origination Packet to packet NAP Packet to circuit termination  Security!

11. Vemuri, Zimmerer,11 Network Access Point ipVerse Control Switch IP/ATM Network Softswitch SIP BCP-T RTP Enterprise SS7 Network Trunking Gateway MGCP Circuit Switch Trunking Gateway SS7 Network Home/SOHO Circuit Switch IP/ATM Network NAP

12. Vemuri, Zimmerer,12 MGC to SIP end user device  Tremendous power in distributing intelligence  Software development at Network Edge Homebrew PBX  Incorporation of Apps in the Network  Security!

13. Vemuri, Zimmerer,13 Intelligence at the Edge Enterprise SS7 Network Trunking Gateway ipVerse Control Switch IP/ATM Network Trunking Gateway SS7 Network Home/SOHO Softswitch SIP BCP-T Circuit Switch Circuit Switch

14. Vemuri, Zimmerer,14 Summary  SIP BCP-T: Open standard for Softswitch to Softswitch Communication  Isolate Legacy Signaling and Maintain Backward Compatibility  Build Scalable Softswitch Networks

15. Vemuri, Zimmerer,15 Proven Interoperability Enterprise SS7 Network Trunking Gateway ipVerse Control Switch IP/ATM Network Trunking Gateway SS7 Network Home/SOHO Lucent Softswitch SIP BCP-T RTP MGCP Circuit Switch Circuit Switch