A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Indirect Presence Publication with the Session Initiation Protocol(SIP)
Author(s) : M. Garcia-Martin, et al.
Filename : draft-garcia-simple-indirect-presence-publish-00.txt
Pages : 12
Date : 2008-02-18
SIP is extended by the SIP-events framework to provide subscriptions
and notifications of SIP events. One example of such event
notification mechanism is 'presence' and this presence information is
carried in Presence Information Data Format (PIDF) documents.
The SIP PUBLISH method specified in RFC 3903 carrying a PIDF document
is typically used when presentities publish their own presence since
these presentities are typically the source of the information.
However, there are cases when the presentity is not the direct source
of the presence information. One such example is location
information where the end host may obtain a reference to location
information as opposed to as a value. The endpoint is typically not
interested in knowing its own location information, but other users
or entities might be. So, if the endpoint gets its own location
information with a reference and wants to publish it embedded in its
presence information, it first needs to de-reference it for getting a
value, and then it can embed that value in its presence information.
While this is certainly a correct sequence, it adds a round-trip to
the presence publication, in addition to a demand processing power
and network bandwidth consumption.
There is a need for a mechanism that the presentity can use to
publish indirect references, such as indirect location references.
This document discusses a few variants that may be used to provide
this functionality.
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