asterisk users - Jul 2007 - Media Proxy Mode in Asterik: SIP and H.323

Hi List;

All we know that in voice, there are a type of
communications between endpoints, for example: in some
communications we do a proxy for media and signaling
while other communications we do a proxy for only
signaling.

Where I can determine these things in Asterisk if I am
using SIP and if I am using H.323?

Regards
--------------
IP Telephony and Contact Center Engineer
Eng. Bilal Ghayad
Mobile: 00965 9849460


     
____________________________________________________________________________________
Luggage? GPS? Comic books? 
Check out fitting gifts for grads at Yahoo! Search
http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz

Bilal,

Asterisk is an IP PBX and thus a back-to-back user agent;  by default, it 
will proxy media.  The only way to disengage it from the media stream is 
to use signaling protocol-specific mechanisms to coax the endpoints into 
talking to each other directly;  in SIP, this can be done via
"re-INVITEs"
a la the canreinvite= option for SIP peers in sip.conf.  The H.323 stack 
in Asterisk may or may not have a similar option, and it may or may not be 
compatible with SIP on a signaling level.  That's if you're connecting
one
endpoint that's H.323 and one that's SIP.  I imagine there's
probably a
way to do media stream handoff between two legs that are natively H.323 on 
both ends.  But that's the determinant.

Also, remember that even if you hand off the media, Asterisk still stays
in the signaling path.  This is all the more true if you're using it as
a signaling gateway between heterogenous protocols.

-- Alex

--
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
Tel    : +1-678-954-0670
Direct : +1-678-954-0671