I have the following problem :
I run ASTERISKWin32 with a AVM FritzCard under capi_chan and a Grandstream GXP-2000. I use a-law codec, because i live in europe.
If i make (or revieve) a call on ISDN line i have a good sound quality on my softphone (EyeBeam) or my Grandstream, but the caller on the ISDN side hears asynchronously clicking noise that sounds like a radiation detector or static. SIP-to-SIP calls are ok (clear sound, no noise)
I tried a low-cost HFC-S card with cologne chip and i don’t have the same problem. (But it runs not correct, because i can’t recieve calls on ISDN line - so i switched back to AVM)
I don’t even think it is a hardware problem with my AVM-Card, because it works well with SIPPSTAR PBX.
Here is what i have tried in the past :
- ISDN line checked
- cable changed
- various .conf modifications
- Hardware check (AMD Opteron DualCore 2,6 Ghz, 4GB RAM)
- AVM-Card changed
- read many similar topics …
So … PLEASE HELP ! I get insane …