- Bronze, 100 points or more
The situation is like this, we replaced their existing box which is cisco 3640 version 11.3.9T. The voice where working fine on that version. Then we changed it to cisco 3660 version 12.0.5 T, 12.1.1 T and 12.0.7 T they noticed that they can't hear any dial tone when they call that box but on the receiver side they can hear their phone ringing. All their existing routers are running on 11.3.9T versions. Is that an IOS problem or do we need some modifications on the router config?