If you mean how do you maske the CLID from an IP phone to a PSTN number, then you can do this in the following places:
1. phone line
2. route pattern
3. route list/route group
4. gateway
If you mean how do you mask numbers for internal (phone-to-phone) calls then you can use translation patterns.
Could you provide more specifics on what you are looking to accomplish?
HTH.
Regards,
Bill
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