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

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Nov 18, 2022 214 likes •274 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

SLIDE 1

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

SIP Call Control : Transfer

Robert.Sparks@wcom.com

SLIDE 2

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

SLIDE 3

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

SLIDE 4

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