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SIP-H.323 Interworking Requirements

SIP-H.323 Interworking Requirements. Joon Maeng joon_maeng@vtel.com. Dave Walker drwalker@ss8networks.com. Background. 3 drafts draft-ietf-singh-sip-h323-00.txt onus on SGW to resolve capabilities University of Brussels thesis focuses on direct mapping Agrawal/Palawat draft

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SIP-H.323 Interworking Requirements

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  1. SIP-H.323 InterworkingRequirements Joon Maengjoon_maeng@vtel.com Dave Walkerdrwalker@ss8networks.com

  2. Background • 3 drafts • draft-ietf-singh-sip-h323-00.txt • onus on SGW to resolve capabilities • University of Brussels thesis • focuses on direct mapping • Agrawal/Palawat draft • emphasis on services • 3 approaches => different implementations • together: an excellent start Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  3. Guiding Principles • SIP UA and H.323 EP communicate • terminals are unaware of interworking • compatible with H.323v2 and RFC 2543 • procedurally compliant • why not H.323v1? why not v3? v4? • may use compliant standard extensions Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  4. SIP-H.323 Signalling Gateway • no media capabilities • optional? not req’d for interoperability (RTP based) • H.323 personality • equivalent to GK in GK-routed but no RAS - so EP • SIP personality • SGW is logically equivalent to proxy/redirect server • not typical UA (no media) • UA since “safer” as peer to H.323 EP Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  5. Logical Model registrar H.323 EP H.323 EP SIP UA UA H.323 GK proxy/redirect Signalling Gateway Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  6. Configurations reg reg EP EP SGW SGW UA UA GK GK proxy proxy reg reg EP EP SGW SGW UA UA GK GK proxy proxy Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  7. Two Phases • Phase 1 - Basic Call • needed now • well understood • Phase 2 - Services • not needed now • less well understood • some desired services under development Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  8. Phase 1 - Basic Call • address resolution (registration & location) • incoming and outgoing call • call signalling • H.323 GK-routed and direct signalled • SIP proxy and redirection • Fast Connect • H.245 tunneling • TCS, MSD, OLC, CLC, EndSession, RTD • no H.323v1 logical channel control • robustness and stability Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  9. Phase 1 - Basic Call (cont’d) • calling/connected line/party services • mid-call signalling • out-of-band: INFO method and User Input Indication • in-band: using RTP (kind of out of scope) • pre-granted ARQ Dave Walker - SS8 Networks Joon Maeng - Onscreen24

  10. Phase 2 - Services Interworking • overlap sending • conferencing • session change (re-INVITE, ModeRequest) • call transfer • call forward • call hold • security: authentication, authorization, privacy • QoS signalling Dave Walker - SS8 Networks Joon Maeng - Onscreen24

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