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FOCUS GROUP 3 Interoperability

This report analyzes and recommends improvements in interoperability between VoIP and circuit-switched networks based on standards and industry practices to achieve seamless data transmission. It focuses on voice-over-IP networks and includes best practices recommendations for network interconnection.

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FOCUS GROUP 3 Interoperability

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  1. FOCUS GROUP 3Interoperability Report to NRIC VI Council September 15, 2003 Cliff Naughton (Boeing) FG3 Report

  2. MISSION • The Committee [FG3] will prepare analyses and, where appropriate, make recommendations for improving interoperability among networks to achieve the objectives that are contained in Section 256 of the Telecommunications Act of 1996, with particular emphasis on ensuring "the ability of users and information providers to seamlessly and transparently transmit and receive information between and across telecommunications networks." FG3 Report

  3. FG3 Participants FG3 Report

  4. FG3 Status • Positive, Co-operative team dynamic • Team Composition (31 members) • Service Providers (wireline, wireless), Vendors, OEMs, Customers, Industry associations • Methodology • Interoperability focus is Voice-over-IP networks with circuit switched networks, both wireline and wireless • Gap analysis from published work of standards bodies (ITU, IETF, etc.) and accepted industry practices to derive best practices and recommended areas of research • Report and Best Practices recommendations in Final Draft FG3 Report

  5. Public Telecommunication Services PSTN IP Networks Network Interconnection Carrier A Carrier B IP SP A IP SP B Carrier C IP SP C Access Networks Wireless/ Satellite Packet Wireless/ Satellite Circuit Wireline Packet Wireline Circuit DSL Cable Users Voice VoIP Data VoIP Data Voice VoIP VoIP Voice Data Data Data Data Broadband Access Scope of VoIP Interoperability Report FG3 Report

  6. Scope of VoIP Interoperability Report • Allow any PSTN and VoIP user to place and receive calls from other users as identified by an assignment of a North American Numbering Plan (NANP) number to that user. • Support portability of NANP numbers across providers for numbers assigned to VoIP users • Provide the means for a VoIP device to access basic PSTN functions, such as using a telephone keypad to interact with a voice mail system • Support PSTN essential services, such as E911, and TTY/TDD • Provide minimum interoperation of VoIP service when features are not available on the other networks • Identify VoIP signaling protocols used between service provider (and some enterprise) networks • Identify methods to achieve VoIP calls of acceptable quality and delay • Identify VoIP protocol standards that could be used to support consumer telephony features (e.g., caller ID, call waiting, hold, etc.) • Provide support for CALEA FG3 Report

  7. Also Included • Voice coding standards for user VoIP devices and gateways within and between service provider and/or enterprise networks • Signaling protocols for user VoIP devices and gateways within and between networks (e.g., H.323 and SIP). • Quality of service requirements • Support over certain types of access networks (e.g., satellite, 802.11 WiFi). • Specifics of vendor interoperability, which is achieved through service provider interoperability FG3 Report

  8. Out of Scope of VoIP Interoperability Report Only interfaces and protocols between networks or service providers are in scope. Interfaces and protocols between a network and a user/subscriber or interfaces internal to a network or service provider are out of scope • Current PSTN and TDM network interoperability • VoIP end-device (e.g., SIP phone) portability between service providers • “Best effort VoIP with no service provider involved” (e.g., intra-enterprise or between VoIP devices over the Internet that do not involve a service provider). • Protocols and interfaces used within a service provider’s network (e.g., Media Gateway Control, Megaco). • Non-consumer voice features (e.g., Centrex, GETS). • VoATM and VoMPLS FG3 Report

  9. Non-ENUM Private Directory Private ENUM SIP/H.323 SIP/H.323 Public ENUM DNS ??? DNS DNS SIP/H.323 SIP/H.323 SIP, SIP-T, BICC, H.323, CMSS SIP/H.323 VoIP QoS IP SP A IP SP B SIP/H.323 VoIP QoS VoIP QoS MEGACO/ H.248 MEGACO/ H.248 Internal to SP Interfaces Internal to SP Interfaces TDM SS7 VoIP=Voice/RTP/UDP/IP PSTN SP A PSTN SP B TDM In Scope SS7 Out of Scope SS7 SS7 LNP TDM TDM Scope of VoIP Interoperability Report FG3 Report

  10. Significant Gaps and Recommendations • ENUM (E.164 Number Mapping) • Policy Decisions and Assignment of Administrators • Synchronization of Public ENUM with LNP • E911 • Need Solution for VoIP Mobility • Network Management and Control • Handling of Overload Scenarios between Different Technologies and Networks • Use of Satellites and Wireless for Communication during Emergency Situations • Coordination of QOS Metrics and Mechanism Standards • Security Areas Relevant to VoIP • CALEA, Firewalls, DNS, Denial of Service FG3 Report

  11. FG3 Deliverable • Final Report to Council including Best Practices Recommendations at December 2003 meeting. FG3 Report

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