SIP Call Control : Transfer Robert.Sparks@wcom.com 47th IETF - - PowerPoint PPT Presentation

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SIP Call Control : Transfer Robert.Sparks@wcom.com 47th IETF - - PowerPoint PPT Presentation

SIP Call Control : Transfer Robert.Sparks@wcom.com 47th IETF draft-sparks-sip-cc-transfer-00 1 TRANSFER New Method Does not alter the original session Decoupled from media handling Does not terminate the session


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47th IETF draft-sparks-sip-cc-transfer-00 1

SIP Call Control : Transfer

Robert.Sparks@wcom.com

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47th IETF draft-sparks-sip-cc-transfer-00 2

  • New Method
  • Does not alter the original session
  • Decoupled from media handling
  • Does not terminate the session
  • Provides knowledge of successful transfers
  • Facilitates recovery of failed transfers

TRANSFER

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47th IETF draft-sparks-sip-cc-transfer-00 3

Transferor Transferee Transfer Target

TRANSFER INVITE 200 OK ACK 200 OK

Transferor Transferee Transfer Target

TRANSFER INVITE 486 Busy Here ACK 603 Decline

Succeeds Fails

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47th IETF draft-sparks-sip-cc-transfer-00 4

Issues / Future Work

  • Rename method? PLEASE-INVITE?
  • Allow bodies?
  • Add knowing that an INVITE was due to a TRANSFER?
  • Add mechanism to prove identity of Transferor?
  • Guidelines compliance
  • Remove Requires header - Probe instead
  • Add short form for Transfer-To header