There is problem that usually happens to our network operator:
Just recently they are implementing NGN as there new core switch that can handle all calls within land line to land line, mobile to land line, and land line to mobile. well for quiet some few days in between we always experience out of services especially when we want to call a land line from our mobile phone and vice versa. My question is if the problem as such happens, what would think the problem be?
If the NGN is affected, what would be the main interface target area?