The document discusses a SIP-ISDN gateway being developed using Erlang/OTP. It describes using SIP for initiating multimedia conferences over IP and integrating SIP with web services. It also summarizes using Erlang/OTP to build the gateway due to its support for concurrency, distribution, and hot code upgrades.

1. A SIP-ISDN Gateway Hans Nilsson CSLab Ericsson Utvecklings AB [email_address]

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

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

6. SIP, Other Example REGISTER REGISTER

7. What is a Gateway? Audio

8. SIP/ISDN Gateway Signalling Gateway Media Gateway Controller Media Gateway ISDN SIP RTP PCM

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

10. Erlang code sizes in number of source lines

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

12. Why Erlang/OTP?

14. Users

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

17. The Future

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