After dialling, monitor the call                        
Func AX 18h
Param DX Maximum number of rings to wait
Return AX Return code as per table below
Delay Dependent on the ring parameter and which event is detected
        After dialling a number, monitor the call.  Return a code
        indicating the event detected.

Return Codes:
    0 - Call answered                  4 - Keyboard key caused abort
    1 - Still ringing past max rings   5 - Timeout or op intercept
    2 - Busy


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