Strange pinging noise during calls

I have rebuilt my * box and have run fxotune and messed around with my echo settings and echo is no longer really an issue ? I have a bigger problem :smiley:

During a call I hear this pinging noise almost like a sonar bounce. I can hear it but the person at the other end cant but if Im talking during the noise they dont hear what I was saying at that time. It doesnt happen all the time and only maybe 2 times every call but its extremely annoying.

Anyone know what it is or more importantly how to get rid of the thing. I thought it might be an echo training tone or something or am I barking up the wrong tree.


we too experienced the same issues, it has got solved after doing fine tuning the pechotraining and echo cancelling parameters.

How did you do that - what commands did you run?

adjust the echocancell and echo trainiing parameters in zapata.conf , if you use tdm cards with fxo trunks