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Title : Problems with the Session Initiation Protocol (SIP) Events Framework
Author(s) : A. Niemi
Filename : draft-niemi-sipping-subnot-issues-00.txt
Pages : 11
Date : 2005-7-14
The Session Initiation Protocol (SIP) events framework enables
receiving asynchronous notification of events related to SIP systems.
This framework defines the procedures for creating, refreshing and
terminating subscriptions, as well as fetching and periodic polling
of resource state. These procedures have a serious deficiency in
that they do not allow state to persist over a subscription refresh,
or between two consecutive polls. Another related but different
problem relates to the relative intolerance of the framework to
interferences in networking connectivity of subscribers in long-
lasting subscriptions. This document explains the problems in more
detail and discusses possible solutions.
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