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Title : An Extension to Session Initiation Protocol (SIP) Events for Issuing Conditional Subscriptions
Author(s) : A. Niemi
Filename : draft-niemi-sip-subnot-etags-02.txt
Pages : 13
Date : 2006-10-26
The Session Initiation Protocol (SIP) events framework enables
receiving asynchronous notification of various events from other SIP
user agents. 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. This
inability to suppress notifications of state already known to the
subscriber results in superfluous traffic in the network. This memo
defines an extension to SIP events that allows the subscriber to
condition the subscription request to whether the state has changed
since the previous notification was received. When such a condition
is met, either the body of an event notification or the entire
notification message is suppressed.
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