Regarding RTP relay (e.g. media proxy), and transcoding --
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.
Certainly this is a common use-case. What do you do? What are best known practices? Commercial media gateway, or open-source solutions?
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.
Ideally, what I'm looking for:
* 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).
* our system then signals the media gateway (mgcp?) to setup the channels, and modifies the SDPs in the SIP path accordingly.
* even more ideally: the media gateway signals our system with inband or rfc2833 dtmf events, plus rtcp reports when available.
I think Asterisk could be hacked to do this.
Does anyone know of a commercial product that's not too expensive? Thoughts? Advice?
thanks,
Dear Sir, Why you need transcoding? It is heavy job for pc server.and you need pay for G.729 license.
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.
Best regards, Gang Liu
----- Original Message ----- From: Ryan Mitchell To: Users@openser.org Sent: Friday, June 08, 2007 10:50 PM Subject: [Users] rtp relay & transcoding
Regarding RTP relay (e.g. media proxy), and transcoding --
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.
Certainly this is a common use-case. What do you do? What are best known practices? Commercial media gateway, or open-source solutions?
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.
Ideally, what I'm looking for:
* 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).
* our system then signals the media gateway (mgcp?) to setup the channels, and modifies the SDPs in the SIP path accordingly.
* even more ideally: the media gateway signals our system with inband or rfc2833 dtmf events, plus rtcp reports when available.
I think Asterisk could be hacked to do this.
Does anyone know of a commercial product that's not too expensive? Thoughts? Advice?
thanks, -- Ryan Mitchell rjm@tcl.net Telecom Logic, LLC http://www.tcl.net
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You are using media proxy w/SER then? Sometimes depending on the combination of customer and carrier we are forced to transcode.
Can some people tell me what systems/software they use for transcoding?
On 6/9/07, Gang Liu gang_l@bol2000.com wrote:
Dear Sir, Why you need transcoding? It is heavy job for pc server.and you need pay for G.729 license.
We use RTP relay too. But we write our own RTP relay server. It couldhandle more than 300 G.729 calls at once with a USD 800 linux pc.
Best regards, Gang Liu
Our own rtp proxy in C++.
Asterisk could do transcoding, you could have a try.
Best regards, Gang Liu
----- Original Message ----- From: Ryan Mitchell To: Users@openser.org Sent: Wednesday, June 13, 2007 4:16 AM Subject: Re: [Users] rtp relay & transcoding
You are using media proxy w/SER then? Sometimes depending on the combination of customer and carrier we are forced to transcode.
Can some people tell me what systems/software they use for transcoding?
On 6/9/07, Gang Liu gang_l@bol2000.com wrote: Dear Sir, Why you need transcoding? It is heavy job for pc server.and you need pay for G.729 license.
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.
Best regards, Gang Liu
-- Ryan Mitchell rjm@tcl.net Telecom Logic, LLC http://www.tcl.net
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