1. © 2001 Hughes Software Systems Ltd. Managing SIP Services Sumit Dhar Product Manager

2. Agenda Managing SIP Services –Why Manage –Issues of Distributed Networks –Service Models –Conclusion

3. SIP Services- Why Manage Evolution –Started as Peer-peer  Proxy just a router  Service logic in the endpoints –Application Server introduced  Network-hosted features –Routing-based –Mid-call  Proxies logical, co-located with App-Server  B2BUA became a monster within itself –Is it worthwhile to define networks sans apps –Standardize Vs Leave it open Many Heterogenous Distributed Elements doing Specialized Functions

4. Service Framework- Complex S-CSCF HSS Cx IM-SSF Camel Service Env Camel Service Env ISC CAP ISC OSA Service Capability Server OSA Service Capability Server OSA API OSA AS Si MAP Sh SCIM AS SIP AS Access Network I-CSCF Border Proxy P-CSCF Outbound Proxy NAT/Firewall Traversal Main Standby Load Balancer

5. Issue: Network Provisioning Network Elements are –Heterogeneous  Function  Database requirements Costly replication –Batch configuration  User CPL activations? Meta-directory? –Partial exposure of subscriber data across network elements –Notify/Elements fetch on their own Availability models –Should data be sync-ed between M& S or with Meta- directory

6. Issue: User Self Provisioning Terminal/Device Self configuration –Home server coordinates, Preferences etc. Issues –Lack of Standards –Impact on Device Mobility –“Last mile” causes maximum “outages” User self-provisioning –CPL based user configuration  Single point of access needed  Should get replicated where ever it needs to

7. SIP Services- Do your own thing Feature states/behavior in endpoint –Security Traversal –Availability –Interactions Network is feature unaware/un-stateful –Proxies are mere routers –May be Basic routing services/ number translation Benefits –Scalable networks –More flexibility to users Limitations –Forces homogenous networks/ capabilities – Charging limited to usage only –Endpoints availability for features

8. SIP Services- Get what you pay for Network delivers services –Handles feature interactions –Subscriber states/ presence –CPL etc. based routing services –API based Mid-call services  Multi-UA contexts- B2BUA Limitations –Scalability –Performance –Complexity Advantages –Choice of charging models –Availability of n/w when endpoint isn’t

9. Managing SLA QoS probes –Adjust charging rates viz. Conference Service probes? Who Guarantees/Monitors? –Network Provider for access network quality –ASP for the application availability

10. SIP Services- Summary Interesting times ahead –Distributed networks tough to provision/manage –Business models yet to mature  May govern how the networks will be deployed  SIP will occupy its right position as an enabler –There may be no killer apps  Integration across various services(web,chat,voice…)  Value sells, not technology

11. Thank You Sdhar@hss.hns.com