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Global Call IP Technology Guide — November 2007 83
Dialogic Corporation
IP Call Scenarios
Figure 29. Successful SIP Unattended Call Transfer, Party B Clears Primary Call prior to
Transfer Completion
A
(Transferring,
Transferor)
App
A
(Transferring,
Transferor)
IP CCLib
B
(Transferred,
Transferee)
App
B
(Transferred,
Transferee)
IP CCLib
C
(Transferred To,
Transfer Target)
App
C
(Transferred To,
Transfer Target)
IP CCLib
GCEV_OFFERED
(CRNt)
gc_DropCall(CRNp)
GCEV_DROPCALL
(CRNp)
gc_ReleaseCallEx
(CRNp)
GCEV_
RELEASECALL
(CRNp)
GCEV_REQ_
XFER(CRNp)
Pre condition: Primary call between A and B is connected (not shown).
GCEV_DIALING
(CRNt)
GCEV_
DISCONNECTED
(CRNp)
GCEV_DROPCALL
(CRNp)
gc_ReleaseCallEx
(CRNp)
GCEV_RELEASECALL
(CRNp)
202 Accepted
GCEV_ACCEPT_
XFER(CRNp)
GCEV_
INVOKE_XFER_
ACCEPTED(CRNp)
NOTIFY(100 Trying)
Subscription-State=active; expires=300
GCEV_INVOKE_
XFER(CRNp)
BYE
BYE
200 OK
200 OK
NOTIFY(200 OK)
Subscription-State = terminated
GCEV_XFER_
CMPLT(CRNp)
REFER
gc_MakeCall
(CRNt, CRNp)
gc_InvokeXfer
(CRNp)
INVITE
GCEV_ANSWERED
(CRNt)
gc_AnswerCall(CRNt)
ACK
200 OK
gc_DropCall(CRNp)
GCEV_CONNECTED
(CRNt)
Primary call is dropped and released.
Transferred call is connected.
Post condition:
Before C responds...
gc_AcceptXfer
(CRNp)