Hi, I have an installation connecting two machines through IAX2. Each machine has 3 FXS and 4 FXO ports. Everything seems to work fine, except on one FXO port, where I constantly get a strange "locomotive" noise when I use it to terminate an IAX2 incomming call. Usually after a while the strange noise goes away, but it is very annoying. Any hints on what can be causing this? Thanks! PHM