[Asterisk-Users] Fail over?

[John E. Elkin]

Maybe its already been posted, but i cant find it...
 
 
I have an asterisk box running agilevoice (Customer signup and provisioning system)
 
I have two sip termination providers.   One provides did and termination.  The other provides just my termination.   My big question is.
 
 
If the termination on provider "A" goes out.. i want my asterisk box to route calls to provider "B" how do i make this happen automaticly?
 
 
John
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