Static CID for single extention

Hi All,

Hope somebody here have some solution for my challenge;

I setup a custom extention to forward a call to my cellphone. I like that when somebody is calling to that extention (internal of external doesn't matter), the CID isn't the caller ID but some static CID what's in some settings. Other extensions and call forwards to a cellphone need to send out the real caller ID, I just need a static CID to send out for one single extension.

Can somebody tell me how I can solve this?

Many Thanks!