In order to understand how does telephony works with a router a have the following configuration :
I made a simple configuration on the router (following the advices of cisco website), which is exactly what you can see on the picture above. I do not have configured any voice-port but they are up and running and according to several website the default configuration is sufficient.
The problem is that I can't make a phone call...
I have several questions:
"Bosch TM13" are used for ISDN networks so it cannot work with this configuration.