send_dtmf_sync
Description:
[ Version ( since = "1.6" ) ]
public bool send_dtmf_sync (string dtmf, Cancellable? cancellable = null) throws Error
  public bool send_dtmf_sync (string dtmf, Cancellable? cancellable = null) throws Error
Synchronously requests to send a DTMF tone the call.
Call objects can only be sent once.
The calling thread is blocked until an incoming call is ready. See send_dtmf for the asynchronous version of this method.
Parameters:
| this | A Call. | 
| dtmf | the DMTF tone. | 
| cancellable | A Cancellable or  | 
Returns:
| 
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