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62 Dialogic
®
Global Call IP Technology Guide — November 2007
Dialogic Corporation
IP Call Scenarios
3.2.4.2 No Response From Party B
As indicated in Figure 16, the transferred endpoint (party B) may not respond to the
ctInitiate.ReturnResult APDU which would cause the T3 timer configured as 20 seconds at the
transferring endpoint (party A) to expire. As a result, the GCEV_INVOKE_XFER_FAIL
termination event would be received at transferring endpoint (party A) and the original primary call
is left connected and in the GCST_CONNECTED state from the perspective of both A and B.
Figure 16. H.450.2 Blind Call Transfer Failure - No Response from Party B
A
(Transferring)
IP CCLib
B
(Transferred)
App
B
(Transferred)
IP CCLib
C
(Transferred To)
App
C
(Transferred To)
IP CCLib
gc_InvokeXfer(CRNp)
FACILITY(ctInitiate.Invoke)
Post condition: Parties A and B remain connected.
GCEV_REQ_XFER
(CRNp)
GCEV_
INVOKE_XFER_
FAIL(CRNp)
Pre condition: Primary call between A and B is connected (not shown).
(No response from
B application)
T3 timer
expires
A
(Transferring)
App