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

[administrator tootai]

Hi list,

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.

Thanks for any hint.
-- 
Daniel