A New Internet-Draft is available from the on-line
Internet-Drafts directories.
This draft is a work item of the Session Initiation Protocol
Working Group of the IETF.
Title : An Extension to Session Initiation
Protocol (SIP) Events for Conditional Event Notification
Author(s) : A. Niemi
Filename : draft-ietf-sip-subnot-etags-02.txt
Pages : 24
Date : 2008-02-25
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 provide no tools to avoid replaying
event
notifications that have already been received by a user
agent. 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 true, either the body of a resulting event notification
or the
entire notification message is suppressed.
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ietf-sip-subnot-etags-02.txt
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