How do I configure Dial-plan redundancy - Priority

Hello
I am setting up Dial Plan to single Destination PREFIX to 2 seperate gateway (not under my control).
1st Gateway as 8 PSTN line
2nd Gateway has 4 PSTN line
how do I configure my cisco 3620 gateway that will allow me to route calls to 1st Gateway as long as all 8 PSTN lines are available.
I know if you configure preference under dial plan like the one below
dial-peer voice 88021 voip
destination-pattern 8802T
session target ivp4:x.x.x.x
preference 10
dial-peer voice 88022 voip
destination-patter 8802T
session target ipv4:y.y.y.y
preference 9
but this does not work as long as IP network is fine. I need as solution that will allow me to route calls to 2nd gateway if PSTN interfaces are all full/busy
These 2 destination gateways are not under my control therefore, I can't request them to use my gatekeeper.
Any other solution that I can try in my gateway
Faisal

This will work. The clal will be routed to the first gateway with prefernce 9 and then if the call fails, the call will be routed to the second gateway with prefernce 10.
The only trick is the call has to fail with an error message which will tell the gateway to hunt. For example user busy will not cause the gateway to hunt. No cirucit or channle, no resource, no route to destination etc will all make the gateway hunt.
You can on the other hand use advanced busyout on the remote gateways to tell the originating when the interfaces are busy.
Taimoor

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