Is there a way to request a specific prefix for a business? I'm responsible for our phone system and we're adding some extensions that fall outside our DID dialing plan. Example internal ext. 224 is 212-555-1224. Our block is 100-399 example: 555-1100, 555-1101, etc. This leaves a whole range of internal extensions that can't be dialable from the outside. We'd like to change that, but we'd like the extensions to match up with the DID. Is this impossible to do?