The invention comprises a method and apparatus for processing a call request from a first enterprise customer network to a second enterprise customer network using at least one dialing plan. Specifically, the method comprises receiving at least one dialing plan request from a first network endpoint in the first enterprise customer network for accessing a second network endpoint in the second enterprise customer network, retrieving at least one dialing plan mapping in response to the at least one dialing plan request, and responding to the at least one dialing plan request using the at least one dialing plan mapping.