I have a central router E1 interface and connects to 04 x BRI interfaces remote router. Each BRI has the following numbers:Bri1/0 - 1111Bri1/1 - 2222Bri1/2 - 3333Bri1/3 - 4444For example, I noticed when 1 of the ISDN number 1111 is out of service, th...