[Asterisk-Users] ISDN BRI voice one way only

[Klemens Kasemaa]

hi

PSTN <--> [Teles ISDN / Asterisk] <--> SIP client

When call is made through ISDN, no matter if taken from PSTN or
Asterisk side, person in PSTN side can hear perfectly but in Asterisk
side I only hear a very scrambled or very low quality voice, words
repeated several times. Same is with echo test (call taken from PSTN)

Setup:
* Teles 16.3 ISA ISDN card with hisax kernel module
* Asterisk 1.0.9 (debian unstable package) with isdn4linux
* Kernel 2.6.12 
* P2 - 333 Mhz / 512 Mb RAM

I found that some persons have had the same problem but no hint for
solution.  Does anybody know how to fix this?


rgrds,
Klem