[Freeswitch-users] voip-voip echo cancel possible

[Brian West]

On Jul 30, 2009, at 8:27 AM, DA wrote:

>
> We have a carrier that we receive calls from over SIP.  They are  
> getting
> the call from the PSTN and then sending to us as sip.  We then get  
> other
> calls to our FS via sip from other carriers that are also from the  
> PSTN.
> We bridge these calls in FS.  All connections to FS are sip.  So.
>
> Party1--PSTN--Carrier1--FS--Carrier2--PSTN-party2
>
> Problem is that Party2 hears echo of themselves.  We chased it down  
> and
> Carrier1 says it is because Party1's carrier is setting a bit in the  
> ss7
> connection that they are doing echo cancel (when in fact, they are  
> not).
> So Carrier1 does not do any EC on the call before passing it to us.

I would take it up with the carrier since that is the point where the  
echo is introduced.
>
> Is there any way that I could do the EC on this call in FS?

Nope.

>
>> From what I have read on the list, it looks like the Zaptel  
>> Hardware or
> OSLEC type of EC would not work here since there is no zaptel/t1
> connection involved with FS.

Only on TDM, You do not need EC on VOIP to VOIP calls.

>
>