Why are you counting twice?  If FS just sits in the middle, would it not use just 4 channels?
 
Is FS the only thing under your control in this scenario?  Otherwise, could you not configure FS<--->Proxy to use the same ptimes so as not to use the Sangoma card?


On Fri, May 31, 2013 at 4:53 AM, Mino Haluz <mino.haluz@gmail.com> wrote:
Hi,

I am thinking of this topology:

caller->freeswitch->proxy

in proxy, there will be some routing module as carrierroute or so and then call is sent back

callee<-freeswitch<-proxy

thing is, if only one call is placed, 4 channels are used. If I used sangoma transcoding card, every channel has to be transcoded to the internal FS coded and back, so 8 transcoding channels in sangoma driver are used for just one call (!). How could I tell freeswitch to do not pass SDP information to the proxy side and let it use only 2 channels as in standard caller->callee call.

Thanks,
Mino

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