When incoming in-band or RFC2833 DTMF events are detected by the media engine's RTP receivers, the DTMF events are "minimally" processed and placed into an internal FIFO queue for full deferred processing. This alleviates RTP receivers from possibly introducing latency in the incoming media path. This startup parameter controls the incoming FIFO depth on a per phone line basis. If your VOIP application is under heavy load, the media engine will send your application the SipPhoneLineIncomingDtmfEventOverflow event if it runs out of FIFO event space in the processing queue. In this case, you should either execute your application on a faster host computer or try increasing the value of this parameter. The internal default value is 5, which is also the minimum allowed value.

public int DtmfIncomingPhoneLineEventBuffers

Public DtmfIncomingPhoneLineEventBuffers As Integer

public:
int DtmfIncomingPhoneLineEventBuffers

public int DtmfIncomingPhoneLineEventBuffers