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A SIP-ISDN Gateway

A SIP-ISDN Gateway. Hans Nilsson CSLab Ericsson Utvecklings AB hans@erix.ericsson.se. What is SIP ?. S ession I nitiation P rotocol, RFC 2345 Initiating, Changing and Terminating Multimedia conferences (IP Telephony) Lightweight Textbased ”Looks like HTTP” UDP (TCP).

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A SIP-ISDN Gateway

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  1. A SIP-ISDN Gateway Hans Nilsson CSLab Ericsson Utvecklings AB hans@erix.ericsson.se EUC'99

  2. What is SIP ? • Session Initiation Protocol, RFC 2345 • Initiating, Changing and Terminating Multimedia conferences (IP Telephony) • Lightweight • Textbased ”Looks like HTTP” • UDP (TCP) EUC'99

  3. Future of SIP? • Easy to implement => many small companies • Mail servers, HTTP Servers, SIP servers • hans@cslab.ericsson.se • sip:hans@cslab.ericsson.se • Web integration; Services on web pages • Click-to-dial EUC'99

  4. INVITE 200 OK ACK BYE 200 OK SIP, Simple Example Audio, video, ... EUC'99

  5. INVITE 200 OK • • • REGISTER INVITE 302 Redirect 200 OK SIP Redirect Server Example EUC'99

  6. REGISTER REGISTER SIP, Other Example EUC'99

  7. What is a Gateway? Audio EUC'99

  8. Signalling Gateway ISDN Media Gateway Controller SIP Media Gateway PCM RTP SIP/ISDN Gateway EUC'99

  9. SNMP HTTP Resending Message support Encode Decode TCP UDP SIP - ISDN State machine SIP stack SIP stack ISDN stack EUC'99

  10. Erlang code sizesin number of source lines EUC'99

  11. 100BaseT IP Network ISDN Network ISDN DSS1 RTP 4 x E1/T1 Distributed Erlang IPI PCI IP Network 10BaseT SIP SIP/ISDN Gateway - realisation SwitchBoard EUC'99

  12. Why Erlang/OTP? EUC'99

  13. Hot code upgrade External interfaces Components/Libraries: Mnesia SASL SNMP Inets GS ... Concurrency lightweight processes Distribution transparent message passing Robustness node fail-over process monitoring Soft real-time Some characteristics [http://www.erlang.org/white_paper.html] EUC'99

  14. Users EUC'99

  15. Mobility Server VoIP Prototype Configuration Feature Feature Feature DECT RE PLMN PTN H.323 SWB H.323 SIP PSTN IPI TNI Wireless LAN IP NT Server: Mobility Server H.323 ISDN SIP EUC'99

  16. Mobility Server VoIP Prototype Objectives • Show Inter-operability between IP Terminals and DECT Terminals or PSTN • Identify effects from implementing existing Mobility Server services over VoIP • Create qualified arguments on SIP versus H.323 for the Mobility Server product EUC'99

  17. The Future EUC'99

  18. Future:Work, work, work... • Standard MG protocol (MGCP,…) • Less prototypish :-) • Administration: • SNMP • HTTP/CGI • Connect to Ericsson Phone Network EUC'99

  19. SwitchBoard IPI SwitchBoard IPI SwitchBoard IPI PCI PCI PCI “Eddie” “Eddie” Redundancy and Capacity SIP “Eddie” EUC'99

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