SipPhoneLineIncomingDtmfEventOverflow

 

The SipPhoneLineIncomingDtmfEventOverflow event is sent to an application when the media engine detects that it cannot keep up with incoming DTMF digit detections. If this event get sent to your application, your application will miss incoming DTMF digits.

To fix this situation, execute your VOIP application on a faster host machine or increase the value of the DtmfIncomingPhoneLineEventBuffers media engine startup parameter.