Re: Registering IP phone with NATeD IP address of Call Manager V
The reason the phone is looking for the non-NAT'd CUCM IP address is because the firewall is not inspecting the TFTP traffic that is used to send the config to the phone from CUCM. The XML file contains these IP addresses. You can either see if there is a TFTP inspect you can run on the firewall to rewrite this, or use DNS names instead which a DNS server outside you NAT could use to resolve to the NAT'd IP.
Also, I think the officially supported method to accomplish what you are trying here is the PhoneProxy feature set on the ASA.
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