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TIPHON Perspective on VoIP Numbering

TIPHON Perspective on VoIP Numbering. John Horrocks (DTI) Tiphon WG4 Chair. Tiphon. Numbering relates to services not technology Regulation depends on services not technology IP can support many different services Aiming primarily at needs of telcos who migrate services onto IP

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TIPHON Perspective on VoIP Numbering

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  1. TIPHON Perspective on VoIP Numbering John Horrocks (DTI) Tiphon WG4 Chair Document IPW-11

  2. Tiphon • Numbering relates to services not technology • Regulation depends on services not technology • IP can support many different services • Aiming primarily at needs of telcos who migrate services onto IP • Naming based on E.164 for public telephony (alternatives not excluded) • Expect telcos will want protected boundaries so design for step/step call set-up with migration to end-end (hacking, quality control, call related charging, culture) • Not dependent on public E.164-IP resolution system for starting

  3. Names and Addresses: Basics-1 • Name: Unique identifier of communicating entity, used by network, may be structured for user and contain geographic information • Address: Location of entity in terms of network structure

  4. Names and Addresses: Basics-2 Acknowledgement: DGTP Netherlands

  5. Main current work areas • IETF: IPTEL general work based on SIP • ENUM selection of means to communicate with E.164 number, based on DNS, precursor to use of SIP for call • IETF: PINT Control connection between PSTN dial-up access and ISP • Tiphon: E.164 to IP resolution Acknowledgement: DGTP Netherlands

  6. Where Tiphon fits in E.164 (Search engines) Choice ENUM Services Services Tiphon E.164 E.164 E.164 URL E.164 SIP IPTEL User@host IP address Acknowledgement: DGTP Netherlands

  7. Switched IP circuit networks networks Different service concepts Common service model Different service model ETSI Tiphon H.323 IETF SIP Voice telephony service SCN telephony IP telephony E.164 E.164 User@host + E.164 Switched IP circuit networks networks Acknowledgement: DGTP Netherlands

  8. Common service numbering Needed for E.164 - IP resolution Customers of IP operators allocated E.164 numbers under this system No updating from users or IP based operators without allocation from NRA Acknowledgement: DGTP Netherlands

  9. Multiple Users (different roles, different persons, distinctive alerting) Multiple terminals Multiple accesses (eg fixed, mobile 1, mobile 2) Multiple service providers Multiple services (eg telephony, fax data, video) The Future: Multi-Everything

  10. Future caller needs

  11. Future solutions • Avoid a wholly new system allow smooth market-led migration • Grow E.164 for different roles/labels • Hide E.164 with better terminals and search engines • Work needed on privacy vs exchange of information to facilitate search engines

  12. Tiphon Approach • Many different voice related services supported on IP • E.164 use depends on service implemented • Interconnected networks with real boundaries • Allow Step-by-step call set-up

  13. Service resolution (may be repeated) Service information could also be accessed by later gatekeepers Service information E.164 - IP routing resolution (may be repeated) E.164 - IP routing resolution (may be repeated) E.164 - IP local endpoint resolution (may be repeated) Search resolution E.164-IP Resolver E.164-IP Resolver E.164-IP Resolver Address book Search engine or Directory Called or Routing E.164 Called or Routing E.164 Called or Routing E.164 Next hop information Next hop information Terminal information E.164 number (directory number) Home Gatekeeper Any information on called party Gatekeeper Gatekeeper IP address for media Called E.164 Routing E.164 IP address for media H.225 signalling Media Calling terminal There are various options for this signalling Route on called E.164 Route on routing E.164 Service information may be accessed either from SCN or IP If present SCN switch Ingress IP gateway Routing mostly uses tables in SCN switches. One switch may use IN for service information SCN technology IP technology

  14. Service resolution Resolves R(E.164) into IP address for Gatekeeper at destination Ingress Gatekeeper Home Gatekeeper Service information Service control Service control Checks availability of terminal Negotiates IP addresses for media channel Routes on IP address but carries calling & called E.164 R(E.164) Cd(E.164) Call control Call control Call control R(E.164) R(E.164) R(E.164) IP address of terminal media port Possible extension to SCN H.225 signalling Cd(E.164) Opens media Signalling SCN switch SCN switch SCN switch Signalling I’face IP Routing (UDP) Media I’face Media Uses IP address from call control contains implicit call identification Ingress Gateway Terminal (or gateway back to SCN) Possible network boundary Possible network boundary Possible network boundary Possible network boundary Uses available interconnections may give some quality control SCN IP Signalling Cd(E.164) = Called E.164 number Media R(E.164) = Routing E.164 number

  15. E.164 - IP Routing Resolution E.164 - IP Local Endpoint Resolution SC SC 1a - Cd R(E.164) or Cd (E.164) 4a - Cd R(E.164) 2a - S2i 5a - STi 6 - Set-up contains S2o may contain M2o 3 - Set-up contains S1o may contain M1o When 2a +2b received STi S2i Start CC CC CC Signalling 10 - Connect may contain MTi 12 - Connect may contain M2i S1o S2o 1b - Reserve media 4b - Reserve media 7 - Reserve media 8 - MTi Reserved 2b - M1o reserved 5b - M2i, M20 reserved 11 - Connect pairs (M2i,MTi), (M2o, M1o) 9 - Activate media 13 - Activate media M2o M1o BC BC BC MTi M2i 1b - Reserve media 4b - Reserve media 7 - Reserve media 5b - M2i, M2o reserved 2b - M1o reserved 8 - MTi Reserved 11 - Connect pairs (M2i,MTi), (M2o, M1o) 9 - Activate media 13 - Activate media M2i MTi MC MC MC Bearer M1o M2o Ingress Gateway Home Gateway Call set-up direction Terminal

  16. SC SC 4a - Cd R(E.164) 2a - S2i 5a - S3i 1a - Cd R(E.164) 3 - Set-up contains S1o may contain M1o When 2a +2b received 6 - Set-up contains S2o, M2o S2i Start CC CC 9 - Connect may contain M2i S1o 7 - Connect S2o 1b - Reserve media 4b - Reserve media 2b - M1i, M1o reserved 5b - M2i, M20 reserved 8 - Connect pairs (M2i,M3i), (M2o, M1o) 10 - Connect pairs (M1i,M2i), (M1o, M0o) M1o BC BC M2i 1b - Reserve media 4b - Reserve media 5b - M2i, M2o reserved 2b - M1i, M1o reserved 10 - Connect pairs (M1i,M2i), (M1o, M0o) 8 - Connect pairs (M2i,M3i), (M2o, M1o) M2i MC MC M1o M2o M1i Network 1 Gateway Network 2 Gateway Call set-up direction

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