I have asterisk 1.8 installed on Dell server with 2 network interfaces (eth0 and eth1),
Eth0 is connected to ISP aaa
Eth1 is connected to ISP bbb
A SIP trunk is configured and working well on the default interface (eth0, via ISP aaa)
is there a way to make eth1 as an automatic backup for the SIP trunk in case of ISP aaa is down (to register and make calls via ISP bbb)??