[asterisk-users] Questions on hardware or software-based echo cancellation

[Olivier]

2012/1/12, Kevin P. Fleming <kpfleming at digium.com>:
> On 01/12/2012 06:39 AM, Olivier wrote:
>> Hi,
>>
>> I'm having some questions related to echo cancellation configuration
>> on a Digium board enabled systems (B410P, TE420, TE420B, ....) for
>> cases when a hardware ech canceller is present or not.
>>
>> I read in TEXXX manual that when setting echocancel=yes in
>> chan_dahdi.conf on a VPMOCT64-equiped system, 128ms hardware echo
>> cancellation was enabled.
>>
>> 1. I'm correct thinking that it is then impossible to switch from
>> hardware to software echo can without removing the VPMOCT64 module
>> itself ?
>> 2. Does the same also apply to HA8 and its VPMOCT032 module ?
>
> With DAHDI 2.6 (and possibly 2.5), it is possible to override the
> configuration and apply a software echo canceller to a channel even if
> it has a hardware one. With prior versions, yes, the echo cancellation
> module would have to be physically removed (or disabled using a
> parameter to the kernel module).

Then, maybe a line mentioning that in the next User Manual edition
would be perfect.
Thanks for replying.

>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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>
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