Re: [OpenSER-Users] [wiki] Adding page about SIP devices supporting presence PUBLISH

El Monday 08 October 2007 10:07:08 Juha Heinanen escribió: Handling "pua_usrloc" with devices supporting PUBLISH is a little pain since there is a "race condition" with periodical REGISTER and PUBLISH sending by the device send. As I said in my first mail, if a device supporting presence publishes "Online - Away" and after a minute it generates a REGISTER (to refresh the "expire" in the server), then this REGISTER will generate a new PUBLISH (made by "pua_usrloc" module), but this PUBLISH will just indicate "Online", so watchers will see "Online". After a while, when the device sends a refresh PUBLISH this will contain "Online - Away", and that is what watchers will see then. That's what I mean a "little pain". In order to avoid htis issue I plan to use "pua_set_publish()" only if the device doesn't support presence PUBLISH. But there is no a cool way to know which device support it or not. Theorically there is: RFC 3840 - Indicating User Agent Capabilities in SIP In this you can read things like: ------------------------------------------------------------------------------------------ Contact: <sip:user@pc.example.com> ;mobility="fixed";events="!presence,message-summary" ;language="en,de";description="<PC>" ;+sip.newparam;+rangeparam="#-4:+5.125" "Examples of typical use: Choosing to communicate with a presence application on a PC, instead of a PC phone application." ------------------------------------------------------------------------------------------ But in fact I've never seen a device indicating this. So I need a way to determine if a device does PUBLISH or not, that is the reason I plan to have a DB table with PUBLISH capable (or not capable) "user-agent" list. And I'd like to know your opinions about this. ;) Regards. -- Iñaki Baz Castillo ibc(a)in.ilimit.es