Patent ID: 8254398

Claim:
A system for migrating a call for a mobile directory number (MDN) from an originating phone to a destination phone which has been intra-service ported from a first mobile switching center of a first technology to a second mobile switching center of a second technology, the first mobile switching center and the second mobile switching center residing within a mobile service carrier's own system, the system comprising: a first mobile switching center: receiving a negative return result from a first home location register (HLR) upon querying the first HLR, the negative return result including at least one of a mismatch and an Unassigned Directory Number (DN), the first HLR operating on the first technology; receiving a local routing number (LRN) for the second mobile switching center upon querying a local number portability (LNP) database storing the LRN associated with the MDN, the LNP database in communication with the first mobile switching center and the second mobile switching center; and routing the call to the second mobile switching center via an inter-machine trunk (IMT), the IMT including data translation for translating data back and forth between the first mobile switching center and the second mobile switching center; wherein the first technology is a time division multiple access (TDMA) technology and the second technology is a Global System for Mobile Communications (GSM) GAIT technology homed in an HLR on the TDMA technology.