Failover SIP trunk In Asterisk

Hi Team,
I have 2 VoIP Minutes provider and i want to set calling for both like:
if one is down then call automatically goes from second one.
Please help me with full details as i am new asterisk user.

Dial will fall through if one fails. Check cause to see if the result of failures at the final destination and, if not, simply issue dial again, via the second provider.

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