Converged Services

1. Converged Services Igor Faynberg (faynberg@lucent.com) Hui-Lan Lu (huilanlu@lucent.com) Bell Labs, Lucent Technologies Workshop on IP-Networking and MEDIACOM 2004, Geneva

2. Outline • What do we mean by convergence? • Adjusting the PSTN to the Internet • Access to the Internet over the PSTN lines • Internet off-load • Adjusting the Internet to the PSTN • IP telephony • PINT • SPIRITS • Unified Messaging • Voice Access to the Web • Porting of PSTN intelligence into the IP telephony world (SIN) • VPN • Conclusion

3. Three Aspects of Convergence 1) Interworking of “traditional” PSTN with the IP infrastructure to support voice over IP 2) Interworking of PSTN with the IP infrastructure to deliver IP-based service control for “traditional” PSTN calls (i.e., IP Telephony without voice over IP) 3) Interworking of PSTN with the IP infrastructure to provide remote access to IP networks via PSTN lines

4. Adjusting the PSTN to the Internet (PSTN access to IP networks) • Exploiting the bandwidth that can be supported by two-wire telephone access lines + Pulse Code Modulation (PCM) modem + Digital Subscriber’s Line (DSL) • Offloading Internet traffic from the PSTN

5. SS7 Network ISP Internet PSTN Congestion due to Internet Traffic PSTN Internet User IngressSwitch EgressSwitch Remote Access Server congestion

6. SS7 Network ISP Internet An Internet Offload Solution IngressSwitch PSTN Internet User EgressSwitch Softswitch Remote Access Server

7. Adjusting the Internet to the PSTN (two aspects) 1) Support of the IP telephony requirements: • A new IP endpoint--IP telephony gateway--is required to interconnect the Internet and the PSTN • QoS must be enforced • The IP and PSTN naming and addressing schemes must interwork 2) The Internet-based support of the PSTN services requirement: • Keep the intelligence at the edges! (Or, at least, share it with the edges)

8. IP Network PSTN Network Access Server dialup access PC-to-PC (1) PSTN as an access vehicle

9. PSTN Enterprise B Enterprise A IP PBX IP PBX Gateway Gateway PC-to-PC (2) PSTN as the backbone transport

10. Gateway Phone-to-PC or vice versa IP Network PSTN

11. Gateway Gateway Gateway Phone-to-phone Home IP trunking IP Network PSTN Enterprise

12. Why IP telephony? • Toll bypass avoids long-distance call charges. • One type of networks for both voice and data simplifies network operation, administration, and management. • Easy integration with other IP applications promises richer than ever telephony services.

13. SCP Soft Switch Gatekeeper Cloud Converged IP Telephony Architecture IVR System Public Switched Telephone Network SS7 voice Media Gateway H.248 H.323 Terminal SIP User Agent voice SIP/H.323 SIP User Agent SIP Server Cloud H.323 Terminal IP Network

14. PSTN • Request to call • Request to fax • Request to hear content • Future: Request to Conference PSTN/Internet Interworking (PINT) PINT Client PINT Gateway SIP SCP Internet Requests Internet Enhancing PSTN Call Control

15. PINT has successfully concluded, but … There are potential services for the future • Multimedia conferencing • Free calls (paid by advertisers) • with the profiling feature • Speed Call list provisioning • Service Subscription • Follow-me service provisioning • Access to communications bills • Account information changes • VPN Provisioning

16. PSTN Services in the PSTN/IN Requesting InTernet Services (SPIRITS) SPIRITS Server SPIRITS Gateway Internet SCP Requests & Notifications • Voice Mail arrival • Phone Off-hook detection • Internet Call Waiting • Internet Caller ID Utilizing the Internet for PSTN Service Notification

17. Telephony Gateway SPIRITS Server Telephony Gateway PINT Client B A Switch Telephony Gateway PSTN PINT Server Telephony Gateway SPIRITS Gateway IP Network C Telephony Gateway SPIRITS Client Service control Joint PINT/SPIRITS Architecture

18. SPIRITS Status 1) The Implementation RFC (informational) RFC 2995 has been published 2) The Architectural RFC candidate has undergone WG last call 3) The Requirements RFC candidate is in the process of consensus building 4) The protocol work is under way

19. Fax Sender Fax Reader Voice Directory Visual Mail Hello... Voice Mail E E-Mail Beep... Beep... Incoming Message Notification Unified Messaging The ability to create, send and retrieve any type of message–anytime, anywhere– with any terminal...

20. Corporate Data Internet HTTP PSTN Intranet VoiceXML Voice Browser Web / Application Server Switch Voice Service Logic Voice Access to the Web • Residential • Stock quotes • Traffic conditions • Web-based Yellow/White pages • Local Events • Personalized Web page services Voice Service Logic on Web Servers

21. Telephony Gateway Soft Switch SIP/INAP Interworking (SIN)[IETF Design Team] Switch Intelligent Peripheral IP Network SIP INAP Service Control Point PSTN

22. Access Server Tunnel Gateway Tunnel Gateway Virtual Private Network PSTN Enterprise IP Network Island Enterprise IP Network Island Internet Tunnel Gateway

23. Conclusion • Regardless of the economical success of the IP telephony, there is room for integration of the traditional telephony and Internet • We consider convergence to be co-existence and symbiosis of the evolving PSTN and Internet (not the consumption of one by another); this symbiosis is manifested in integration • Integration of pure IP telephony with the PSTN has been worked in the IETF enum and megaco WGs together with ITU-T SG 2 and SG 16, respectively. • Intelligent Network is a natural PSTN platform to support such integration; ITU-T SG 11 and IETF (pint, spirits) have had a productive cooperative effort to this end. • The emphasis of the industry now is on enhanced services rather than “pipes”; services are key differentiators • RECOMMENDATION: the standards organizations should concentrate on providing building blocks for developing services in converged networks