Dialogic M7324 - Manual (Page 149)

4. PBX Systems
Completing the Transfer
To complete a call (supervised or blind), press the transfer key again with the
dx_dial(&), where & acts as a key press of the transfer key. The application
must handle the on-hook state after completing the transfer.
Aborting the Transfer
A transferred call can be aborted at any time (prior to completing the transfer)
by pressing the appropriate appearance key where the original call resides.
The application can perform this only in a supervised transfer mode. For
example, if the original call resides on the first appearance key (Feature Key
00), dialing dx_dial(KA) brings the original caller back to an active
state.
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