function sets what sounds a party on a call that is unanswered or on hold
will hear. Except for basic parameter validation, it is a straight pass-through by
TAPI to the service provider.
| HCALL hCall,
| DWORD dwCallTreatment
Handle to the call. The application must have OWNER privilege.
One of the call treatments supported on the address on which the call appears,
as indicated by LINEADDRESSCAPS
. LINEERR_INVALPARAM is returned if the specified treatment is not supported.
Returns a positive request identifier if the asynchronous operation starts;
otherwise, one of these negative error values:
LINEERR_INVALCALLHANDLE, LINEERR_INVALCALLSTATE, LINEERR_INVALPARAM,
LINEERR_NOMEM, LINEERR_NOTOWNER, LINEERR_OPERATIONFAILED, LINEERR_OPERATIONUNAVAIL,
The use of call treatment functionality should be limited to controlling of
legacy equipment. New equipment is generally designed so that instead of call
treatments being generated by external switching equipment, calls would be
connected to PC-based audio sources and signals generating using standard Win32
functions such as the multimedia Wave API.
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