Adding on to Hasans post (+5 M.H.), I am guessing you want to transform the E.164 number so that it lines up with your end user dialing behavior from the Cisco phones (i.e. 4-digit dialing). Specifically, I am assuming you want to address how the number is presented in the phone's Corporate Directory.
You have two methods:
1. Use the method Md Hasan describes. This is what we do for most of our customers that find themselves in this situation. You may need to work with your AD systems folks to do this programatically.
2. Use a custom corporate directory application on an external web server that uses the native E.164 format but transforms it before rendering the directory list on the phone. We do this for our customers. Usually we go this route if the AD guys aren't cooperating (rare) or the customer has a special need such as variable length dialing that is site dependant or adding another field such as mobile phone.
HTH.
Regards,
Bill
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