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>