All you would need to do in cucm is configure a sip trunk to the channel bank and then configure route patterns pointing to that trunk.
As far as the 4900 I've never configured one. You would need to read their install guide for sip integration.
No different than any other gateway. You'd point the DN's for the FXS ports to the sip gateway.
You'll have to see this as having two separate systems, it will require call routing from both ends to get it working. Again though, no different than any other sip integration.
Have you considered running fiber to that remote connection, installing a POE switch and giving users IP phones?
If that's not an option for you for some reason, have you considered and cisco FXS gateway instead? It might save you some trouble.
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