1. SIP & SS7 (SIP-02) Monday - 09/10/07, 10:00-10:45am

2. SIP-SS7 Interworking @ the Application Layer Vince Lesch VP of Product Marketing

3. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com Agenda Network Evolution Key Transitional Challenges Seamless Connectivity Service Deployment and Access –SCIM –IM-SSF NGN Control Layer The Build Out Steps Summary 3

4. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com 4 Network Evolution - Growing the NGN PSTN Region PSTN Region Cost Reduction at the Core through VoIP PSTN Region SIP PBX IAD VoIP End-Point Expansion of VoIP to Enterprise & Residential SIP Services Introduction of services based on SIP application servers SBC VoIP Edge Proxy Edge Proxy VoIP Peering RAN MG A/Abis RAN MG A/Abis MSC Server R4 MSC servers introduction

5. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com 5 Key Transitional Challenges Technical Challenges –Mergers & acquisitions have resulted in operators supporting several versions and variants of the same product & protocol –Seamless service connectivity across hybrid networks –Legacy system connectivity to newer systems –Systems integration and multi-vendor interoperability –Stability of standards, vendor implementation of standards Business Challenges –Investing in the future while supporting today’s users –Capping expenditures in the “pre-IMS” technology –Cost effectively running a hybrid network –Providing new services to subscribers on old & new networks –Making the business case for IMS work

6. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com Seamless Connectivity TDM for access, IP at the core for transport Interworking between ISUP and SIP for call completion. BICC (Q.1902) used in 3G R4 architectures is based on ISUP which simplifies interworking IETF, ITU-T and 3GPP Standards for ISUP & SIP Interworking: RFC 3372/3398, Q.1912.5, 29.163 PSTN/ ISDN PSTN/ ISDN LE PSTN/ ISDN PSTN/ ISDN LE Call Server ATM, IP backbone BICC, SIP Call Server SS7 ISUP SS7 ISUP Media Gateway Media Gateway Media Gateway Media Gateway SIP AS 6

7. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com IMS Architecture for Svc Provisioning 7 Source: TS 23.218 IP Multimedia (IM) session handling; IM call model; Stage 2

8. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com SCIM Service Orchestration & Mediation IMS-to-IN (SIP-SS7) Exposing legacy services into IMS domain (Ex. LNP in IMS domain) IN-to-IMS (SS7-SIP) Access to next generation applications (Ex. LHS & MHS) IN-to-IN (SS7-SS7) Mediates services implemented using different technologies (Ex. CAMEL Consolidation) IMS-to-IMS (SIP-SIP) SCIM functionality mediates SIP services in the IMS World (FMC, MM-IM & Presence) Service Orchestration & Mediation STP Function CSCF Function MGCF Virtual SIP AS Virtual SSP LNP CNAMAIN 1188AIN Virtual SCP SSP MSC Virtual SIP UA Voice AS SSP IN AIN MGCF VCC MM-IM Presence Bridging IN/AIN & IMS Applications 8

9. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com Service Orchestration & Mediation Vendor 1 MSC/SSP Vendor 1 MSC/SSP Billing Control Billing Control PRBT VPN/LNP Expensive to add multiple protocols Vendor 2 MSC/SSP Vendor 2 MSC/SSP Presence SIP App Server SIP App Server SoftSwitch/ CSCF SoftSwitch/ CSCF New Network Services Interaction Virtual SCP Virtual SCP Subscriber Mediation Virtual SIP AS Virtual SIP AS Service Orchestration (SCIM) Interaction across multiple CAMEL and IMS Application Servers Service Meditation (IM-SSF) Mediate between CAMEL and SIP Service Clients/Server nodes Mediate between SS7 variants Variations SS7 only SIP only SIP & SS7 9 Network AND market requirement to combine SCIM and IM-SSF functionality into one product

10. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com 10 SIP Signaling Router = SIP STP PSTN SIP AS (B2BUA) SIP PBX IAD VoIP End-Point SBC VoIP Edge Proxy Edge Proxy RAN MG A/Abis RAN MG A/Abis MSC Server SIP STP Cost Reduction at the Core through VoIP Expansion of VoIP to Enterprise & Residential Introduction of services based on SIP application servers VoIP Peering R4 MSC servers introduction Scalable signaling infrastructure

11. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com Current NGN Implementation - IP layer routers - IP routing protocols - IP QOS controls SIP AS SIP AS PSTN GW MSC Servers IP PBX SIP End-Points Multimedia Servers Softswitch 11 Distributed policies and information

12. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com NGN 2.0: Dedicated SSR Session Layer 12 Multimedia Servers - IP layer routers - IP routing protocols - IP QoS controls SIP AS SIP AS Softswitch PSTN GW MSC Servers IP PBX SIP End-Points Session Routing Engine Session Routing Engine Session Setup URI Routing Service Orchestration IOT Point

13. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com 13 The Build Out Steps TDM MSC STP SIP AS SIP AS IMS Voice AS Service Orchestration (SCIM) AND Mediation (IM-SSF) CAMEL INAP SMSC Multimedia IM IMS Media Server SSR SIP Media Server Softswitch Sigtran ISUP/INAP Softswitch Transit MGC/ MGCF S-CSCF I-CSCF P-CSCF

14. September 10-12, 2007 Los Angeles Convention Center Los Angeles, California www.ITEXPO.com Summary Network evolution present operators with many challenges –Network – operating a hybrid network for many, many years –Services – consistency across networks and transparency to the customer –Business – proving in the business case (leverage what you’ve got) Migrating at the signaling control layer … a logical choice –Service mediation (IM-SSF) & interaction (SCIM) across pre-IMS & IMS domains –SIP signaling & session control layer in the NGN brings benefits now –Unified Signaling Control Plane: SS7 STP = SIP STP = IMS CSCF Transitional technologies will be key for the next 3 - ? years Minimize investment in “pre-IMS” technologies Service continuity across hybrid networks Leverage existing investment in key IN/AIN applications (e.g., number portability) by making them available to both domains during transition to IMS A good transitional strategy is essential to making the IMS business case work 14