[Freeswitch-users] FS as Media Gateway Only

[David Ponzone]

Vitali, Code,

I apologize, I answered too quickly.
That's actually a very smart way to do it when you don't have/want a  
proprietary protocol.

It should be possible to distribute the calls evenly by using mod_limit.
You can even take the transcoding into account.
If you know your media servers will only use G711 to the outside, you  
can call mod_limit once if the inbound call is G711 also, but you may  
call mod_limit twice or thrice or more (to be calculated) if the  
inbound call is G729.
This way, your mod_limit figures per media server will reflect the  
actual load on the server, not only the number of current calls.


David Ponzone  Direction Technique
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Le 27/05/2010 à 08:15, Vitalii Colosov a écrit :

> Hi Code,
>
> I have working example doing exactly what you've described.
> One signalling FS bridges incoming call to a set of media servers  
> (depending on ip, but you can implement any routing logic including  
> round robin) and then transfers media stream after bridging to that  
> media server.
>
> You can achieve this on signalling FS by creating a Lua script that  
> contains the following lines:
>
> media_server="my_media_X.mydomain.com"; --to be determined by  
> routing logic
> forwarding_session = "sofia/ 
> external/"..called_number.."@"..media_server;
> session:setVariable("bypass_media_after_bridge", "true");
> session:setVariable("hangup_after_bridge", "true");
> session:execute("bridge",forwarding_session);
>
> The call will arrive to the selected media server successfully and  
> media stream will start bypassing signalling FS after bridge.
>
> You can read the following thread, it describes how you can setup  
> such configuration.
> http://lists.freeswitch.org/pipermail/freeswitch-users/2010-March/055231.html
>
> I think it will fit your needs.
>
> Regards,
> Vitalie
>
>
> 2010/5/27 Code Ghar <codeghar at gmail.com>
> Is it possible -- and are there any case studies, practical  
> experience, etc -- on deploying FreeSWITCH (FS) in this  
> architecture: one server (FSSIP) handles SIP signaling only, and  
> multiple servers (FSRTP1, FSRTP2, ..., FSRTPn) handle all media  
> responsibilities? So when a call comes in, the SDP contains IP of,  
> say FSRTP1, as media handler. For this to work, FSSIP would request  
> FSRTPx for media resources for each new call and add its IP and port  
> in SDP. The media servers/gateways would play IVR, etc.; collect  
> DTMF and forward as appropriate to FSSIP; perform transcoding; etc.;  
> all while FSSIP only deals with signaling. This way multiple servers  
> could be deployed to handle media responsibilities and only a  
> handful would be required for signaling. In future if there's a  
> greater need for transcoding, etc. all you need to do is deploy a  
> media server and not have to add servers for signaling.
>
> This idea came to me because I have come across two proprietary  
> applications that do it this way. They have a SIP component and a  
> media component. You can run both on the same physical machine or  
> you can separate them out into multiple machines.
>
> Another way for this could be to integrate FS as a media component  
> to another application's SIP component. A mix-and-match, so to speak.
>
> On the flip side, deploy FS as a SIP server and use media  
> capabilities of some other hardware or software application. For  
> example, FS handles signaling and use dedicated hardware for media.  
> A good example of this is illustrated (somewhat) by an image on  
> Sangoma's website: http://www.sangoma.com/assets/images/content/transcoding_diagram.jpg 
> . Look at the "pooled transcoding".
>
> Is FS even designed to be this modular? If so, how can the  
> aforementioned scenario(s) be achieved?
>
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