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Global Call IP Technology Guide — November 2007 59
Dialogic Corporation
IP Call Scenarios
3.2.3 Successful H.450.2 Blind Call Transfer Scenario
As indicated in Figure 14, the precondition for blind transfer is that the transferring endpoint (party
A) and the transferred endpoint (party B) are participating in an active (primary) call and are in
GCST_CONNECTED from the perspective of the Dialogic
®
Global Call API. Completion of a
successful blind transfer results in the eventual termination of the primary call, and the creation of
the transferred call. Note that the connection of the transferred call is not a mandate for the
completion of a blind transfer. It is always possible that the transferred call itself may possibly be
left unanswered after ringing (Alerting indication) and eventually abandoned and still be
considered a successful blind transfer from the perspective of the transferring endpoint (party A).
Successful blind transfer, in this regard requires only that some response notification (that is, either
Alerting or Connect) was received from the transferred-to endpoint.
For simplification purposes, Figure 14 does not indicate the opening and closing of logical
channels (and the associated media sessions) because the control procedures are consistent with
typical non-transfer related H.323 calls.