[Asterisk-Users] Rough Two Days

[Sean Cook]

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On Tuesday 14 February 2006 10:56, Sean Cook wrote:

>> we had originally purchased a tdm2400 with echo cancellation but
>> couldn't fit it in the chassis.
>>
>> Spent 3 - 4 hours tracking down the source of the echo to no
>> avail, enabled mark2 echo cancel and aggressive echo cancel to
>> get the system to where the customer was satisfied with the
>> performance.
>
>
> If you have the echo cancellation hardware then the choice of
> canceller has *zero* effect on the echo cancellation UNLESS you
> disable VPM support. If VPM support is enabled (default) and
> detected, then the echocancel=yes enables the hardware echo
> cancellation. The software echo canceller is not used, and all the
> options of choice of cancellation algorithm and agressive options
> do nothing in this case.
>
We ended up using one of the TDM400, with no echo cancellation. Which
yes... I understand hw echo cancellation is the preffered method...

>> Came back to the lab, pulled out a duplicate system, had the same
>> problem. So I swapped out the Digium card with an OpenSwitch6,
>> all of my problems went away! No echo, great call volumes and
>> better yet, I picked up the ability to swap the ports from FXS to
>> FXO. I will admit there was some difficulty with the vpb drivers
>> as some things have changed in the >2.6.11 kernel that cause it
>> to fail, but Voicetronix support was GREAT! I am extremely
>> pleased with this hardware and it integrated into AMP with almost
>> no effort.
>
>
> You don't specifically mention it, but did you contact Digium
> support throughout any of this? Offhand, what is the pricing like
> between the TDM2400E and the OpenSwitch6?
>
With comparable number of ports the difference is about the same...
OpenSwitch 12 ( to get the same port count ) = 1500, the TDM2400 =
1345 + break out $119 =~ 1500.00

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