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 January 2019. <https://www.yourdictionary.com/event-messaging>.
event messaging. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/event-messaging
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