GetTouchTone method
This method will return the first touch-tone in the touch-tone queue. Since
the ActiveAG touch-tone queue works in a FIFO (first in, first out) manner, this
will be the earliest tone received. If there are no tones in the touch-tone
queue, this method does not attempt to read any from the connected call. It simply returns immediately
with a tone or without one.
If a character is read from the touch-tone queue, it is removed from the queue
and will no longer be available there. See the
Arguments: None.
Returns: A BSTR containing a single touch-tone digit, if any are available on the
queue. If none are available, then AagErrNoTone is returned.
Property interactions: None.