LanScape VOIP Media Engine
SipSubscriptionRequiresAuthentication
The SipSubscriptionRequiresAuthentication event is sent to an application when the application made an attempt to subscribe to an event offered by another telephony device and the subscription requires authentication.
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.