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In relation to RFC4480: RPID: Rich Presence Extensions to the Presence Information Data Format (PIDF) there is no activity for DND: Do not disturb.

On the other hand there are many SIP telephone systems on the market that does support DND. Is there a convention to support DND in a "standard" way for presence?

Community
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Raphael Bossek
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1 Answers1

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DND is a slightly different animal than merely a status, which SIMPLE can accomplish. More specifically, it's a state of the UA that affects behavior. In the real world, this is usually implemented by handsets by by returning a 480 Temporarily Unavailable, or in the case of a system acting as a B2BUA, this usually works in concert with SIMPLE to convey user status and the local PBX returns a 480 on their behalf in the first leg of the INVITE. For example, this is how the 3Com VCX does things, and Adtran PBX's.

In a nutshell, SIMPLE could only say you are unavailable, not actually effect it. To the best of my knowledge this is no standard, and if there is, I have not seen it used. Caveat: my experience is limited to the 3Com, Aastra, and Adtran systems.

Josh
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  • Thank you a lot for this answer. Related information can be faound in RFC-3261 (Core für SIP) at chapter 21.4.18 480 Temporarily Unavailable. – Raphael Bossek Jul 13 '11 at 08:20
  • Additional reading can be found in SIP implementors mailing-list at https://lists.cs.columbia.edu/pipermail/sip-implementors/2008-April/018968.html There is also a draft regarding DND at http://tools.ietf.org/id/draft-elwell-bliss-dnd-01.txt – Raphael Bossek Jul 13 '11 at 12:12
  • In RFC4479 the chapter "3.3.2. Reach Information" is also good to know, because it's not really DND but comparable: *It is also possible for a presence document to contain a service that has no reach information at all. In such a case, the presentity is indicating that the service exists, but is electing not to offer the watcher the opportunity to connect to it.* – Raphael Bossek Jul 17 '11 at 15:58