[asterisk-users] tuning software echo cancellation

[Gordon Henderson]

On Thu, 10 Jun 2010, Jeff LaCoursiere wrote:

>
> On Thu, 10 Jun 2010, Gordon Henderson wrote:
>
>> On Thu, 10 Jun 2010, Jeff LaCoursiere wrote:
>>
>>> We are totally out of touch on the subject of software echo cancellation in
>>> asterisk.  The system is running 1.4.28 and Dahdi 2.2.1-RC2.  I understand that
>>> when Dahdi detects no HWEC, it enables SWEC by default. Is there anything I can
>>> do to tweak the settings to try and make this liveable for the client until we
>>> get the card?  The server is in the Caribbean, so it may actually be a bit
>>> before the card arrives.  We would love to get them running before then, but it
>>> is so bad right now that we cannot.
>>
>> I've been using OSLEC and TDM400 type cards for a while now (openvox). It
>> "just works"
>
> Isn't OSLEC on by default?  Or is this something I must turn on
> specifically?  If it is on it isn't doing much in our case :)

I compile up stuff from scratch, so a lot might depend on your 
distribution..

You need the module dahdi_echocan_oslec loaded, and in 
/etc/dahdi/system.conf, I have:

   echocanceller=oslec,1-4

Gordon