Switchvox - How do you route an existing incoming DID to a cell phone?

The simplest course of action would be to add a call cascade rule to the call rules of the extension that routes from the incoming DID you want to forward. The call cascade rule would then need to be setup to route to the cell phone number.

For more information on adding call cascade rules to an extension, please see the following KB article: How to create a call cascade rule?