134 Global Call API for HMP on Windows Programming Guide — August 2006
Using Global Call to Implement Call Transfer
Figure 36. Call State Model for Blind Call Transfer at Party A
GCST_NULL
GCST_IDLE
GCST_INVOKE_XFER
GCEV_DISCONNECTED
(XFER CMPLT)
GCEV_RELEASECALL

Transferring Party

(Party A)

GCEV_INVOKE_
XFER_FAIL
GCST_INVOKE_
XFER_ACCEPTED
GCST_CONNECTED or
GCST_HOLD
GCEV_INVOKE_XFER
GCEV_INVOKE_XFER
GCEV_INVOKE_XFER_ACCEPTED
GCEV_INVOKE_XFER_REJ
GCEV_INVOKE_XFER_FAIL
GCST_DISCONNECTED
GCEV_DROPCALL