[Asterisk-Dev] presence and IM again, want to develop a working "hack"

[Joshua Colp]

Greetings,

I'm presently working on Messaging and Presence solutions in Asterisk for
the Google Summer of Code program. I should have a public site/CVS server so
people who wish to venture into trying it out can download it soon. As for
presence itself, cvs head sorta kinda supports it... It's hard to explain.

- Joshua Colp. 

-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Juraj Bednar
Sent: Monday, July 04, 2005 2:01 PM
To: asterisk-dev at lists.digium.com; asterisk-users at lists.digium.com
Subject: [Asterisk-Dev] presence and IM again,want to develop a working
"hack"

Hello,

   I was again asked to try to add support for presence
(SUBSCRIBE/NOTIFY) and IM using SIMPLE. I have few questions:

   a.) are there any, at least partial projects, patches, anything, that at
least partly implements presence and/or IM to chan_sip? I don't care about
presence on other channels, I have one SIP client per user. I've read this
list's archive several times and found lots of wonderful proposals, which
try to convince asking users, what needs to be done to support this well
(multichannel, multiple phones per user, ...), mainly saying, that without
very difficult reworking of internals, it would not be supported. What I
really need is to hack it into chan_sip.c. I need the support of other
channels and applications (f.e. MeetMe), but where I really care about
presence and IM is SIP.

   So, any project, hack, patch, anything, that would allow me to go further
with this would be greatly appreciated. I found this page in
Russian: http://www.asterisk-support.ru/forums/development/53843189454
that somehow deals with the problem. I tried babelfish translation,
(http://babelfish.altavista.com/babelfish/trurl_pagecontent?lp=ru_en&trurl=h
ttp%3a%2f%2fwww.asterisk-support.ru%2fforums%2fdevelopment%2f53843189454)
but I was not able to find out, if it really at least partially solves this
problem, but as far as I understand it, Windows Messanger makes use of
Subscribe/Notify, so this should be it.

  b.) Anyone has a partial solution using SER (which supports presence and
IM) as a frontend, but routing all calls through Asterisk? Can this be done?
I need the calls to go via Asterisk (I don't mean only sip notifications,
but also the data, so I have canreinvite=no). So basically, SER would be a
registrar "proxy" to Asterisk, which would do the authentication. The only
thing, that SER would do would be to handle presence and IM and pass
everything else on to Asterisk (as far as I know, SER can't pass traffic
through it. I need the data to pass through the SIP server, since machines
in my network topology don't see each other, it's a star with Asterisk in
centre -- quite poetic indeed:). Any ideas, pointers to similiar
configurations, ... are welcome.

  c.) If there is no solution to start with, is it possible to implement it
only to chan_sip? I'm not familiar with Asterisk source code at all. Where
are the places to look (in chan_sip.c) which are best to hook this code.
Again, any code, hints, etc. about the structure of the source code are
really welcome. Doing this in a clean way (although it's a hack) so it can
be reused by community as much as possible is my intent. If anyone wants to
help with the project by donating coder's time, mail me off the list.

  I hope I'll be able to support presence for hardphones and Xten's eyeBeam
softphone in a few days with your help.


     Best wishes and thanks for any replies,

         Juraj.
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