You can use a translation pattern for all calls from your phone that go through something like an XXXX translation pattern for internal calls to change your calling number to 5151. The better solution would be to use calling party transformation patterns. You configure a new partitions something like pt-ani, and a new CSS such as css-ani. Then make a calling party transformation pattern of 4141 in the pt-ani partition and mask the number to 5151. Now you will have to set the calling party transformation CSS of css-ani on either the device pool or device level. This is a different CSS field than the normal one used for placing calls. You can then do a similar thing with another partition and CSS for your gateways to make your ANI (calling party number) the full number for external calls.
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