SIP-Based Enterprise Communications Platforms

1. SIP-Based Enterprise Communications Platforms Pat Rudolph Vice President, Solutions Architecture 3Com Corporation

2. Is SIP Over-Hyped? • Remember ISDN promises in 1990? • Remember ATM in LAN infrastructure? • Remember VoDSL (GR-303 back-haul)?

3. $2,000,000,000 Large $1,500,000,000 Medium $1,000,000,000 Small $500,000,000 IP Telephony Inflection Point $- CY00 CY01 CY02 CY03 CY04 CY05 CY06 Year LAN Telephony Adoption (Average of Analysts) United States Line Shipments Voice Market Overview LAN Telephony Market North America Source: Synergy Research Aug 2003 Three primary segments: • Small Business looking for Key Solutions (single site small) • Small & Medium enterprise looking for Hybrid/PBX Solutions (1-5+ sites 10-100+ users) • Medium & Large Enterprises looking for PBX Solutions (1000-5000 total users across 100+ sites) Replacement of old systems driving upgrades to IP Growing market in all segments – One size does NOT fit all

4. The Market Favors Simplicity • Ethernet versus Token Ring, FDDI, ATM • Packet versus Cell • TiVo versus VCR • SIP versus H.323, MGCP, Proprietary

5. Ingress Directory Accounting Egress Ingress GW Gatekeeper Egress GW T1/PRI Server Server T1/PRI Q.931 SETUP Q.931 CALL_PROCEEDING H.225/RAS ARQ (AuthenticationAdmitLocationRequest) ODBC Directory Lookup Request ODBC Directory Lookup Response H.323IngresstoEgressCall Set-Up!! MSMQ Ingress Start CDR H.225/RAS ACF (AuthenticationAdmitLocationResponseSuccess) H.225/Q.931 SETUP (fastStart) H.225/RAS ARQ (AuthenticationAdmitEgressRequest) H.225/RAS ACF H.225/Q.931 CALL_PROCEEDING (fastStart) H.245 Full Duplex Logical Audio Channel Is Now Open MSMQ Egress Start CDR Q.931 SETUP (ANI,DNIS) Q.931 CALL_PROCEEDING Q.931 PROGRESS In-band Feedback H.225/Q.931 PROGRESS Q.931 PROGRESS In-band audio established (examples include error messages or in-band ringback) Q.931 ALERTING Out-of-band Feedback H.225/Q.931 ALERTING Q.931 ALERTING Q.931 CONNECT Q.931 CONNECT_ACKNOWLEDGE H.225/Q.931 CONNECT Q.931 CONNECT Q.931 CONNECT_ACKNOWLEDGE

6. 100 TRYING F6 Q.931 Call Set-Up OFF HOOK RTP w/ SDP (ESTABLISHED) F13 Analog Voice Q.931 Connect ACK ON HOOK Q.931 Disconnect BYE F15 BYE F14 Q.931 Release 200 OK F16 200 OK F17 Q.931 REL-Complete SIP Phone to PSTN Phone Call Flow SIP Phone A CLASS 5 SIP PROXY SIP GWY INVITE F1 407 PROXY F2 ACK F3 INVITE F4 INVITE F5 Q.931 Proceeding 180 RINGING F8 180 RINGING F7 Q.931 Progress Q.931 Alerting 200 OK F10 200 OK F9 ACK F11 ACK F12

7. ACCT DIR/PROV PROXY SIP SIP SIP SIP ENTERPRISE GATEWAY IP Backbone 10/100 10/100 A-LINKS SS7 - STP A-LINKS SS7 - STP IMT T-I IMT T-I CHICAGO HOUSTON PRI/T-I PRI/T-I DMS100 Class 5 DMS100 Class 5 DMS 250 Class 3 DMS 250 Class 3 DMS100 Class 5 DMS100 Class 5 MCI “IP Communications” (circa 2002)

8. IP Telephony Is Step #1 After IP telephony, what applications are you considering for your Converged Network? Video Conferencing Messaging Audio Conferencing Collaboration Contact center / CTI Nemertes Research, 2004 % 0 10 20 30 40 50 60 IP Telephony must be more than dial tone…

9. SIP - It’s Not Just Dial Tone • RFC 2543 abstract (1999) • The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating, modifying and terminating sessions with one or more participants. These sessions includeInternet multimedia conferences, Internet telephone calls and multimedia distribution.

10. SIP-Based Services • Voice Mail • (IVR) Interactive Voice Response • Unified Messaging • User Mobility • Presence • Personalized Call Treatment • Find Me/Follow Me • Instant Messaging • Conferencing

11. Next-Gen Voice Messaging • Voice Messaging has been ubiquitous since 1995 • Telephone answering primarily • Unified Messaging has been advertised, but not delivered- Why? • Unified Messaging – Definition? • Practical “on paper” • Not practical to deliver • IP Technology will make Next Gen applications as ubiquitous as VM has been • Practical to Implement - new architecture, new technology • Tools to migrate • Reliable - simple design with redundancy

12. IP Messaging Value Proposition • Problem • Proliferation… • Connected devices • Communications accounts • Leads to an unmanaged explosion of connection demands—missed messages, multiple log-ins • Solution • UMS puts the control back in the hands of the user • How? • Single Smart Mailbox • Message media translation– voice and text • Network bridging – PSTN, IP • Device agnostic – cell, PDA, PC, pager • Enables users to set up access rules • Intelligent routing for messages

13. INVITE INVITE RTP Architectural Differences Stateless SIP Proxy

14. INVITE INVITE 200 OK 200 OK RTP Architectural Differences B2BUA

15. Communication Portal Speech Access Wireless Access Security Services XML, VoiceXML Business Apps Groupware, IM, ERP, CRM etc. System Mgmt. Svcs. Converged Communication Applications Suite Web Services IP Telephony IP Conferencing Personal Assistant IP Messaging Collaboration Contact Center XML VoiceXML SIP CCXML Communication Services Media Services Database Services Call Processing, Availability, Directory, Location, Authentication etc. Video, Speech LDAP, JDBC Network Infrastructure Routers, Switches, Firewall, etc. Media Gateways SNMP A P P L I C A T I O N B U I L D E R

16. Summary • SIP is becoming de facto choice for IP Communications • Interoperability • Large developer community • Architecture matters! Choose platform with modular services, published APIs, and flexibility to adopt new protocols