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4. PBX Systems
Completing the Transfer
To complete a call (supervised or blind), press the transfer key again with
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 resided on the first appearance (Feature Key 00),
dialing dx_dial(<ESC>KA) will bring the original caller back to an active
state.
Example
An application answers a call and plays a greeting message prompting the
caller to enter the extension they wish to reach (the caller enters 221). Using
the dx_dial( ) function with the dial string (&,221), the application attempts to
transfer (supervised) the call to extension 221. Call progress analysis is used
to determine if extension 221 is answered, busy, or there is no answer. If
extension 221 answers, the application needs to use dx_dial( ) to press &
again to complete the transfer and hang up after the transfer is complete. If the
extension is busy or not answered, the application reconnects to the incoming
call and plays a message asking the caller to choose between accessing voice
mail or transferring to the operator.
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