I use ISDN with AVM C2, also fritz pci with tdm fxs & sip phone without any echo.
what isdn channel driver are you using? I suggest using the avm with capi+chan_capi-0.3.0 and turn
on echosquelch in capi.conf....
That is my configuration (0.3.0, echosquelch=1 in the general section of the capi.conf
What version of * are you running, and did you do any changes to the Makefile?
rgds pos
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