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To Rent or Buy the IP PBX? Maybe it’s Both…. Building a VoIP Solution That Enables Both Topics • • • • • To Rent or Buy the IP PBX? Barriers to Both Session Controllers Enterprise Applications Carrier Services To Rent or Buy? • Both improve user experience, reduce OPEX and offer similar features • IP Centrex farms hassles of ownership to service providers and also has a better disaster/survivability story • IP PBXs can be used with a range of service providers and can migrated to gradually. • Hedge your bets – use IP Centrex to provide services to SOHO while you IP enable existing PBXs or deploy IP PBX in larger offices. Barriers to Both • Using VoIP interconnects creates some challenges -- TDM is an implicit firewall and normalizes VoIP traffic. • Security – How do calls traverse existing firewalls and NATs? • Interoperability – How do calls go off-net? – How can other SIP applications be leveraged? – What are the pain points? VoIP Security • Firewall implementations are a barrier to real-time services – Security policies prevent promiscuous and ad hoc connectivity – Lack protocol awareness for H.323 and SIP • IP PBX – Firewall traversal needed to reach the corporate PBX • IP Centrex – Multiple NAT traversals required to reach SOHO users – Firewall traversal needed to reach corporate users Broadband Corporate PBX SOHO VoIP Incompatibilities • Applications are SIP based while network infrastructure and IP PBXs continue to be H.323 dominated – 90% of VoIP Networks are H.323; 90% of VoIP Apps are SIP – Prevents enterprises from leveraging SIP apps from carriers. • Standards are subject to interpretation – Problem areas: message formats, message order, timing • Other problem areas arise because of endpoint limitations – Codec mismatch – Mismatch of DTMF transport methods – T.38 fax Doing Both • Session Controllers enable carriers and the enterprise to control, route and manage VOIP traffic in a secure and seamless manner • Needed for IP Centrex since IP is the delivery mechanism – Overcome security issues to reach end-user – Simplify off-net connectivity to PSTN gateways • Provides greater ROI for IP PBX deployments since IP can be used to connect with the user and the network. – Convert trunks to VoIP by replacing TDM gateways and reduce access charges by converging voice and data. What is a Session Controller? • AKA Border Controller or Session Border Controller • New breed of networking technology that provides layer 5 routing and control to manage real-time traffic flows in IP networks • Technology addresses issues of: – – – – – Session routing Network security Call admission control Signaling interoperability Service quality Session Controller Architecture SIP Softswitch Network ASP CSC ESC ESC PSTN Softswitch PSTN Orig/Term ESC ESC H.323 Network Broadband Enterprise Peering Broadband NAT Traversal Carrier Peering Core SC vs. Edge SC • Core Session Controller (CSC) – – – – Signaling only platform deployed in the network core Programmable route engine Centralized CDR collection Call Admission Control on a network basis • Edge Session Controller (ESC) – Edge Session Controller deployed at the network edge to manage interconnects (both media and signaling) – NAT and Media Routing for network security – Signaling Interoperability and interworking (abstraction layer) – Call Admission Control on a local basis – Media processing for specialized applications such as transcoding How Does a Session Controller Work? INVITE Call Bridge (IWF) SIP Ingress Leg SIP Egress Leg ARQ, LRQ, Q.931 H.323 Ingress Leg H.323 Egress Leg Databases Routing and CAC Logic ARQ, LRQ, Q.931 Static H.323 INVITE, REGISTER Media Routing Fabric NAT/PAT FCP SIP Unauthorized Media Authorized Media Media Dynamic Signaling • Complex because VoIP technologies are incompatible – H.323-SIP, H.323-H.323, SIP-SIP, etc. • Abstracts signaling from routing providing any-to-any calls • Multi-service: Video and Voice Media Routing • Selective – media flow may be off-net or between trusted endpoints • NAT/PAT of media and signaling enables topology hiding • Dynamic “pinholes” for media prevents unauthorized access • NAT traversal provided for subscribers using broadband network access Media Processing • Media translation applications: – Normalize media codecs – DTMF processing • Selective use limits the number of DSPs needed and optimizes platform costs Enterprise VoIP Applications Untrusted Trusted Public Network (PSTN) Unified Messaging System HQ IP Telephone Local & LD CSC H.323 IP PBX SIP H.323 Desktop Client ITSP ESC ASP Campus PBX SOHO Hosted PBX H.323 SIP Data VPN H.323 ESC SIP PBX ESC VoIP Enabled Router Domestic Sites ISP IP PBX IP Telephone Desktop Client International Sites IP PBX IP Telephone Desktop Client Let Service Providers Simplify the Problem Hosted PBX Media GW SS7 SS7 CSCserves as a route engine between IP platforms and service based CAC CSC TDM Termination PBX Tieline IP PBX TDM Legacy PBX Carrier Backbone ESC ESC performs local CAC, signaling adaptation (e.g. H.323/SIP), NAT and Media Firewalling PBX Tieline Carrier Services • Offering managed PBX services • Hosted PBX or IP Centrex • Bundle those services with long distance and other valued added services like teleconferencing • Early providers: Level3, Masergy, GoBeam • Trials: SBC, Verizon Enabling Enterprise VoIP • Session controllers enables the enterprise to hedge their bets on IP Centrex and the IP PBX • Session controllers simplify VoIP deployment by overcoming issues of VoIP security and incompatibility • Session controller position the enterprise for the future by providing a foundation for other real-time IP application Dan Dearing Vice President of Marketing [email protected]