| Abstract
|
This document defines a Session Initiation Protocol (SIP) event
package for registrations. Through its REGISTER method, SIP allows a
user agent to create, modify, and delete registrations. Registrations
can also be altered by administrators in order to enforce policy. As
a result, these registrations represent a piece of state in the
network that can change dynamically. There are many cases where a
user agent would like to be notified of changes in this state. This
event package defines a mechanism by which those user agents can
request and obtain such notifications.
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