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Converged Services

Converged Services. Three Aspects of Convergence. 1) Interworking of “traditional” PSTN with the IP infrastructure to support voice over IP

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Converged Services

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  1. Converged Services

  2. 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

  3. 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

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

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

  6. 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)

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

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

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

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

  11. 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.

  12. 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

  13. 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

  14. 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

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