Has anyone experienced echo when setting up an Asterisk PBX? We have a couple of them setup and one that is fed by analog lines gets awaful echo. We have tried modifying the echo and receive /transmit parameters, but have been unable to come up with the right combination.
In addition the phone lines were experiencing interference from a local radio station and we had to put filters on the stop the noise. The side affect is that some tones are not captured properly when customers attempt to dial an extension.
Any suggestions would be greatly appreciated.