[Asterisk-Users] EADS6550 and asterisk - echo on PSTN call

[administrator tootai]

Rich Adamson a écrit :

>>would like to know if some of you have tested asterisk connected to an 
>>EADS 6550 analogique PBX (also know as Nexpan50).
>>
>>Our set up is a Dell Optiplex with 1 TDM400 4 FXO, 1 TDM400 4 FXS, (no 
>>other card, each of them have their own IRQ) all ports connected to the 
>>EADS. We have GS ATA286 as EP. Calling from ATA to ATA give a perfect 
>>sound. Calling to PSTN numbers or reverse side, give echo.
>>
>>We can do what we want in zconfig.h (STEVE2, MARK2, MMX, 
>>AGGRESSIV_SUPPRESSOR, NOECHOCAN_DISABLE) or zapata.conf (tx gain=-10.0, 
>>echocancel=32 ... 256,), test with differents POTS phone, it change 
>>nothing. We even didn't notice changes between our various changes in 
>>those files (and yes modules where unloaded between each test). Always 
>>the same echo.
>>
>>So know we start to doubt that this echo problem is asterisk related but 
>>perhaps more to the PBX. That's why we ask if some of you have/had 
>>similar setup with this PBX and if there is a solution.
>>    
>>
>
>You didn't mention what country your in; if you outside the US, be sure
>to config the TDM-fxo card for your country (eg, line impedance).
>  
>
France.

>You mention echocancel=32, etc, did you try echotraining=800?
>  
>
Yes. It create a second echo :-(

>For my TDM-fxo in the US, using the following on each channel works fine:
>
>echotraining=800
>echocancel=yes
>echocancelwhenbridged=yes
>rxgain=5.0
>txgain=0.0
>  
>
Do you have this setup with the standard zconfig.h (MARK2)?

Thanks for your reply.
-- 
Daniel