getDtmfToDial
Get waiting DTMF to dial.
Return
The DTMF digits. null if either no digits were sent in the specified call or the call is invalid.
Parameters
call
The call to get the waiting DTMF digits from.
Get waiting DTMF to dial.
The DTMF digits. null if either no digits were sent in the specified call or the call is invalid.
The call to get the waiting DTMF digits from.