Basically CME is just a H323 router with some extra bits to run SCCP to the handsets.... So once your handsets are registered and you can call internally, you need to set up voice ports and dial-peers to reach the outside.
At it's simplest, you would first configure your physical BRI ports (do this for each of your 4) -
no ip address
isdn switch-type basic-net3
This example is from a router in the UK, make sure you have the right switch type for your provider.
Then do the voice-port:
In this example I need the compand-type command as the default is u-law on the router, but in the UK we use a-law... On other modules the BRI2/0 would correspond to the voice-port2/0 but the EVM modules are different - if you can't work it out check the docs for your hardware.
Finally you need a dial-peer to send calls to the interface you specify - so if you want to send all calls starting with 9 to the BRI interface above:
dial-peer voice 1 pots
You would need 4 of these dial-peers, with preference ascending on each, and the port pointing to each of your 4 BRIs... so the next dial-peer would be:
dial-peer voice 2 pots
How you route calls inbound will depend on what you've ordered from your provider...
Hope this gets you started...
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