In IP telephony, any time the status of a call control device or end point changes, an event message is sent, such as asking for permission to drop the call. See IP telephony.
"event messaging." YourDictionary, n.d. Web. 16 October 2018. <http://www.yourdictionary.com/event-messaging>.
event messaging. (n.d.). Retrieved October 16th, 2018, from http://www.yourdictionary.com/event-messaging
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