The SetCallCancelTimeout procedure allows an application to control how long the media engine will wait for outgoing call CANCEL responses from the far end of the call.

When the media engine transmits a CANCEL request for an outgoing call, it expects to receive a "200 OK" response for the transmitted CANCEL request and a "487 Transaction Terminated" response for the initial INVITE request. Note that the "487 Transaction Terminated" response received will also be answered by a final ACK from the media engine.

The media engine will then wait the "CallCancelTimeout" as set by the API procedure for the "200 OK" response. It will also wait the "CallCancelTimeout" for the "487 Transaction Terminated" response. The order of these responses does not matter. If the media engine does not receive both expected responses, the phone call will proceed with cancel termination. If the responses arrive after the time out as set by the API procedure, the responses will be ignored.

public VoipMediaEngine..::.TELEPHONY_RETURN_VALUE SetCallCancelTimeout(
	uint CallCancelTimeoutMs
)

Public Function SetCallCancelTimeout ( _
	CallCancelTimeoutMs As UInteger _
) As VoipMediaEngine..::.TELEPHONY_RETURN_VALUE

public:
VoipMediaEngine..::.TELEPHONY_RETURN_VALUE SetCallCancelTimeout(
	unsigned int CallCancelTimeoutMs
)

public VoipMediaEngine..::.TELEPHONY_RETURN_VALUE SetCallCancelTimeout(
	UInt32 CallCancelTimeoutMs
)