Anthony Baxter a �crit :
I'm the author of a package called Shtoom, a VoIP software suite
written in Python (using Twisted). I'm thinking about adding Jabber
support to Shtoom for the purposes of discovering someone else's
SIP address (thus avoiding the need for a SIP registration server,
plus people can use their existing Jabber accounts rather than having
to create a new identity). I'm at something of a loss as to how to
do this - should Shtoom publish the SIP address, or should it instead
ask another XMPP client "I want to make a SIP call", and it can then
decide to send back the SIP address. I've not been able to find existing
work in this area - TINS looks interesting, but it's not really what
I'm looking for right now.
I already wrote to discuss it some time ago ; the proposed solution was
the following:
1) use disco to know the other end does VoIP ;
2) discuss which VoIP protocol to use with the remote end like this:
ASK:
<iq type='get'
from='[EMAIL PROTECTED]/JabberHelper'
to='[EMAIL PROTECTED]/Babili'
id='neg1'>
<feature xmlns='http://jabber.org/protocol/feature-neg'>
<x xmlns='jabber:x:data' type='form'>
<field type='list-single' var='http://jabber.org/protocol/voip'>
<option><value>h323</value></option>
<option><value>sip</value></option>
<option><value>callto</value></option>
</field>
</x>
</feature>
</iq>
ANSWER:
<iq type='result'
from='[EMAIL PROTECTED]/JabberHelper'
to='[EMAIL PROTECTED]/Babili'
id='msg_2'>
<feature xmlns='http://jabber.org/protocol/feature-neg'>
<x type='submit' xmlns='jabber:x:data'>
<field var='http://jabber.org/protocol/voip'>
<value>h323</value>
</field>
</x>
</feature>
</iq>
3) Setup a call in the now known protocol:
ASK:
<iq type='set'
from='[EMAIL PROTECTED]/JabberHelper'
to='[EMAIL PROTECTED]/Babili'
id='neg1'>
<query xmlns='jabber:iq:oob'>
<url>h323:h323.voxgratia.org</url>
<desc>VoIP call</desc>
</query>
</iq>
REPLY:
<iq type='result' to='[EMAIL PROTECTED]/JabberHelper' id='neg1'
from='[EMAIL PROTECTED]/Babili'/>
Notice that "http://jabber.org/protocol/voip"; isn't valid yet, since I
didn't write to the registrar about it yet -- now that gossip seems to
go forth again, I'll certainly be more interested in doing so.
Snark on #gnomemeeting
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