It is important to note that the DNIS you receive from the PBX really should have the pod code prefixed before the gateway receives it. It is important because you have complex dial plans and you will be very limited by the number of translations you can perform on each trunk.
This is a very simple example, but it should give you some idea of how this will work.
Dial-peer 10 is the inbound pots dial-peer on the source gateway. Dial-peer 20 is outbound to the POD A gateway.
Dial-peer 30 is the inbound voip dial-peer on the POD A gateway. Dial-peer 40 is the outboud pots dial-peer on the POD A gateway. You will replace ....... with the correct number of digits or the T parameter if the digit strings are variable.
direct-inward-dial may be required on pots peers if the interface supports DID.
On source gateway:
dial-peer voice 10 pots
dial-peer voice 20 voip
session target ipv4:
On Pod A gateway:
dial-peer voice 30 voip
incoming called 1.......
dial-peer voice 40 pots
Again, if you must prefix/translate in the gateway then you'll be limited by the number of translations (15) you can configure per trunk.
Here's some examples of how to prefix the DNIS. I'm assuming PodA numbers begin with 555321, PodB 666321, and PodC 777321. Of course this will depend on your dial plan.
If i use translation-rule to change digit, What kind of character using? that is all match such as * or .
And Is it possible to use that incoming calls from specific PBX to another specific PBX between gateways?
In my opion, If All PBX enviroment may possible, but Not in VoIP network. because Calls using VoIP didn't consider some specific PBX, that is, calls doesn't know the origin PBX and destination PBX. all calls just use IP routing paths..is it a right?
For your first question, you should take a look at the following link. It describes the translation rule syntax. the .* is a wild card that means any number of any digits. You could replace it with your dial-plan for a specific PBX.
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