I have a very strange problem with FXS ports. Analog phone is connected to FXS port on a 2800 router. When the phone is called from an IP phone the analog rings when it is answered the IP phone displays "Connected" but it continues to ring after few seconds it goes to fast busy.
The analog phone can call the IP phone without any problems.
The gateway is MGCP the CCM is 4.2.3
I have a TAC case open but I was just wondering if anyone ever experienced something like this.