I've got a problem trying to do very basic FXO - FXS configuration. When i try to call from main site to remote site everything is working fine.
But the problem is when i try to call , from main site, a phone localized on remote site there is no ring on the FXS phone. it doesn't ring out on REMOTE phone ,though if I pick , I can hear or make conversation clearly.
Please find attached the config of the two routers (MAIN and REMOTE) and a drawing of the architecture.
Of course, i've tried differents analog phones to be sure that the problem is not coming from hardware pb on the phone. I have also tried all the signal frequency parameters (25. 50, ...) on voice-port where phone is connected, but no change.
Could you have any idea of the problem ?
Thanks in advance for your help,