[asterisk-users] tuning software echo cancellation

[Jeff LaCoursiere]

On Thu, 10 Jun 2010, Gordon Henderson wrote:

> 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
>

Ahh.  I see that the "MG2" canceller is installed by default, and I see by 
Google that it is not very much liked.  SVN'ing the latest OSLEC now.

Thanks for the advice!

Cheers,

j