I have two Asterisk servers,
- E1(PRI) Gateway Asterisk 1.4 with E1(PRI) card
- IP-PBX Asterisk 1.8 on VM Server
When my e1 gateway is failed (ex. shutdown, no power...), PSTN automatically switch to analog lines
but when my IP-PBX is failed I want to make the gateway to route the call back to the PSTN again and there switch the call to an analog line.