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<DIV><FONT face=宋体 size=2>Dear Sir,</FONT></DIV>
<DIV><FONT face=宋体 size=2> Why you need <FONT
size=3>transcoding? It is heavy job for pc server.and you need pay for G.729
license.</FONT></FONT></DIV>
<DIV><FONT face=宋体></FONT> </DIV>
<DIV><FONT face=宋体 size=2> We use RTP relay too. But we write
our own RTP relay server. It could handle more than 300 G.729 calls at once with
a USD 800 linux pc. </FONT></DIV>
<DIV> </DIV>
<DIV>Best regards,<BR>Gang Liu</DIV>
<DIV><FONT face=宋体 size=2></FONT> </DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 9pt 宋体">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 9pt 宋体; font-color: black"><B>From:</B>
<A title=brak2718@gmail.com href="mailto:brak2718@gmail.com">Ryan Mitchell</A>
</DIV>
<DIV style="FONT: 9pt 宋体"><B>To:</B> <A title=Users@openser.org
href="mailto:Users@openser.org">Users@openser.org</A> </DIV>
<DIV style="FONT: 9pt 宋体"><B>Sent:</B> Friday, June 08, 2007 10:50 PM</DIV>
<DIV style="FONT: 9pt 宋体"><B>Subject:</B> [Users] rtp relay &
transcoding</DIV>
<DIV><BR></DIV>Regarding RTP relay (e.g. media proxy), and transcoding
--<BR><BR>This topic has come up many times before in various forms, but I
still have not found any obvious solution that's highly scalable and cheap
(well sure, I can dream). We have lots of customers behind various
firewalls using various codecs. Customers call each other (both parties
behind firewall) and to/from carriers. <BR><BR>Certainly this is a common
use-case. What do you do? What are best known practices?
Commercial media gateway, or open-source solutions?<BR><BR>We use both OpenSER
and a custom B2BUA written against the NIST Java stack. We need a way to
transcode when needed. Obviosly mediaproxy module is great, but doesn't
transcode. <BR><BR>Ideally, what I'm looking for:<BR><BR>* at the point where
our system determines that transcoding or rtp relay is needed, a media gateway
is chosen based on network proximity (e.g.: 1/2 our customers are in the U.S.,
1/2 in Brazil; should pick a media gateway accordingly to minimize network
path).<BR><BR>* our system then signals the media gateway (mgcp?) to setup the
channels, and modifies the SDPs in the SIP path accordingly.<BR><BR>* even
more ideally: the media gateway signals our system with inband or rfc2833 dtmf
events, plus rtcp reports when available.<BR><BR>I think Asterisk could be
hacked to do this.<BR><BR>Does anyone know of a commercial product that's not
too expensive? Thoughts? Advice? <BR><BR>thanks,<BR>-- <BR>Ryan Mitchell
<<A href="mailto:rjm@tcl.net">rjm@tcl.net</A>><BR>Telecom Logic,
LLC<BR><A href="http://www.tcl.net">http://www.tcl.net</A>
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