I have the environment with VoIP, which FXO are inserted in routers and my network is running VoIP.
I have everything works fine, but I have a doubt, about a "noise", that I think is a normal noise.
When I call from one location toanother, before the other person answer the phone, I listen a noise like "TUU" before we will start the conversation.
My environment have routers with FXO connected with Switch PBX in both locations.
I would like to know, if have a command, where I can to eliminate this noise.
Any help is welcome.