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

Nov 18, 2022 •214 likes •272 views

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

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 • Provides knowledge of successful transfers • Facilitates recovery of failed transfers 47th IETF draft-sparks-sip-cc-transfer-00 2
Succeeds Fails Transferor Transferee Transfer Transferor Transferee Transfer Target Target TRANSFER TRANSFER INVITE INVITE 200 OK 486 Busy Here ACK ACK 200 OK 603 Decline 47th IETF draft-sparks-sip-cc-transfer-00 3
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 47th IETF draft-sparks-sip-cc-transfer-00 4

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