LanScape VOIP Media Engine
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.