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Digit Gathering
Besides enabling digit monitoring and being notified of digits one at a time,
an application can also request that multiple digits be collected in a buffer.
Only when the buffer is full or when some other termination condition is met is
the application notified. Digit gathering is useful for functions such as
credit card number collection. It is performed when an application calls lineGatherDigits, specifying a buffer to fill with digits. Digit gathering terminates when one
of the following conditions is true:
- The requested number of digits has been collected.
- One of multiple termination digits is detected. The termination digits are
specified to lineGatherDigits, and the termination digit is placed in the buffer as well.
- One of two timeouts expires. The timeouts are a first digit timeout,
specifying the maximum duration before the first digit must be collected, and an
inter-digit timeout, specifying the maximum duration between successive digits.
- Digit gathering is canceled explicitly by lineGatherDigits again with either another set of parameters to start a new gathering request
or by using a NULL digit buffer parameter to cancel.
When terminated for any reason, a LINE_GATHERDIGITS message is sent to the application that requested the digit gathering. Only a
single digit gathering request can be outstanding on a call at any given time
across all applications that are owners of the call.
Digit gathering and digit monitoring can be enabled on the same call at the
same time. In that case, the application will receive a LINE_MONITORDIGITS message for each detected digit and a separate LINE_GATHERDIGITS message when
the buffer is sent back.
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