You'll need to achieve this using a TCL script running on your voice gateway(s). In addition, the gateway will need to be running (or be converted) to a dial-peer signaling protocol - such as H323. Check out http://www.ciscoxmlservices.com/en/tcl--ivr-scripts and there is a script called Number to Name. In addition, if you search the forums for TCL scripts then some of the members have scripts they have written for purposes such as this.
Hailey
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