I enabled echo cancelation.
i Tested with only two ISDN devices - and B200P ISDN phone and Asterisk.
also through the ups, the light turns on B200P get bad sound in the headset, as I described earlier. I recorded the sound.
i discovered next situation:
i call and speak to isdn phone when is asterisk down. voice is normal.
when driver is loaded is voice bad, when loads echo cancelation is voice normal again.
then i call again and voice is bad.
I think this is some sethings problem.
I would be very grateful for assistance.
i setup loging. after 18.7.2001 - 8:36 i made a call to asterisk and picked up ISDN phone before asterisk (bad sound)
after this i made a call from sip phone on asterisk trhru B200P outside (voice ok)
8:36 call again inside and picked up on ISDN phone linked width asterisl B200P first port (bad sound).
I send you the log files.