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Overcoming the Limitations of Softswitch Architectures

Overcoming the Limitations of Softswitch Architectures. Kevin Holmes Senior Solutions Architect, EMEA PTC 2005. Problems where VoIP has proven effective. Transport Switching Interconnect Carrier – Carrier Enterprise – Carrier Applications. Top and bottom line enhancing

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Overcoming the Limitations of Softswitch Architectures

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  1. Overcoming the Limitations of Softswitch Architectures Kevin Holmes Senior Solutions Architect, EMEA PTC 2005

  2. Problems where VoIP has proven effective • Transport • Switching • Interconnect • Carrier – Carrier • Enterprise – Carrier • Applications • Top and bottom line enhancing • Flexibility and enforceability are key • Control points IMTC Forum – May 2005 – Eibsee, Germany

  3. Flexibility Media and Signaling Routing based on trust boundaries “Any-to-any” interworking – SIP, H.323, multiple vendor interoperability High Performance and Scale “On-demand” Media Processing Leverage and enforce existing peering agreements Call Admission Control Prevent Denial of Service attacks and service abuse/theft Call accounting Call Detail Record (CDR) generation and reporting Topology Hiding Go across address boundaries Control Points Segmentation/classification of traffic VoIP Peering Requirements IMTC Forum – May 2005 – Eibsee, Germany

  4. What is a Session Controller? • Point of control for multimedia signaling and media • Service protection • Network isolation and insulation • Policy Enforcement Point for real-time multimedia services IMTC Forum – May 2005 – Eibsee, Germany

  5. What are Carriers’ Real-time Session Management needs? • Call routing with multiple business models: • Wholesale • Transit • Pre-paid • Post-paid/retail • Service brokerage • Special applications • Permissive dialing • End-to-end capacity management IMTC Forum – May 2005 – Eibsee, Germany

  6. SIP Network PSTN H.323 Network Broadband NexTone Session Controller Architecture Real-time Session Manager (RSM) Media GW CarrierPeering SBC SBC SBC PSTNOrig/Term ConsumerNAT Traversal Enterprise IP PBX’s IP Phones IMTC Forum – May 2005 – Eibsee, Germany

  7. SBC Aggregation Carrier IP Network • Multiple interconnects between same carriers • Multi-stage and hierarchical call admission control • RSM maintains notion of aggregate capacity Partner Carrier IP Network RSM SBC IMTC Forum – May 2005 – Eibsee, Germany

  8. Merits of this Approach • No “control” protocol • Call admission control based on network egress policies • Ability to add other service selection logic • Applications • Quality of Service demanded or provisioned • Call routing with mixed business models • Wholesale • Pre-paid or post-paid • Transit • Normalized and vendor independent call routing • SIP only IMTC Forum – May 2005 – Eibsee, Germany

  9. Other Advantages • Implementation flexibility • Redirect server • Stateful SIP proxy • B2BUA • RSM function can be partially integrated into SBC • Leverage TRIP (rfc 3219) and TGREP • View SBCs and Gateways as originators and terminators of sessions IMTC Forum – May 2005 – Eibsee, Germany

  10. What about the “Softswitch”? • “Control” paradigm has limited effectiveness • Gateway control • Call control • Softswitch designed for a “closed” network • MGCP/MEGACO to provide total control of internal network • How does one build a fabric of softswitches? IMTC Forum – May 2005 – Eibsee, Germany

  11. IP Multimedia Subsystem (IMS) Architecture IMTC Forum – May 2005 – Eibsee, Germany

  12. IP Multimedia Subsystem (IMS): Enabling QoS for Real-time Services • Bridging between IMS layers and the underlying transport network for granular end-to-end QoS is essential. AS AS AS MGCF SS7 MGW Services PSTN Application Aware Endpoint Aware RSM SBC SBC Control Session Aware Edge Router Edge Router IP MPLS IP IP Transport QoS IMTC Forum – May 2005 – Eibsee, Germany

  13. New VoIP Market Opportunity IMTC Forum – May 2005 – Eibsee, Germany

  14. Summary • Session Controllers are essential for VoIP peering • Real-time Session Managers provide higher level functionality, based on SIP signaling • Traditional softswitch based architectures are being transformed • Softswitches as media gateway controllers pushed to the edge of the network with abstracted call control functionality in RSM • IMS architectures reflecting this trend IMTC Forum – May 2005 – Eibsee, Germany

  15. Scaling the Network for Real-time Services • IP Multimedia Subsystem (IMS) architecture provides control for real-time services over a converged network • NexTone’s customers, 200+ production networks, are using an IMS-like architecture to deploy and control a diverse portfolio of real-time services to carrier partners and enterprise/residential customers MSW (CSCF) MGCF MGW MSC IP IP PSTN MSC MSC IP IP IMTC Forum – May 2005 – Eibsee, Germany

  16. Thank You. kholmes@nextone.com; +44 7968 152 704 www.nextone.com IMTC Forum – May 2005 – Eibsee, Germany

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