LanScape VOIP Media Engine
SipEventNotifyReceived
The SipEventNotifyReceived event is sent to an application when another telephony device has generated an event that the application has subscribed to. This event is also sent to the application when an unsolicited NOTIFY SIP message is received and unsolicited NOTIFY processing has been enabled using the SetReceivedUnsolicitedNotifyState API procedure.
When an application receives this event, the media engine event callback procedure SIPCALLBACKPROC will have a non zero value assigned for the pEventData parameter. This value is a pointer to the NOTIFY_REQUEST structure which contains additional information for this event.