LanScape VOIP Media Engine
SipSubscriptionTrying
The SipSubscriptionTrying event is sent to an application when the application is making an attempt to subscribe to an event offered by another telephony device. This event is sent to the application for information purposes.
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 SUBSCRIBE_RESULTS structure which contains additional information for this event.