Systems and methods for terminating telephony communications to a mobile telephony device that is roaming outside of its native service area make use of a forwarding termination service. Also provided are methods of making such compositions. The method adopts the current DM combined with a user simulation technique and further employs a specially designed scoring function, so as to automatically generate a plurality of new DMs. Individual ones of the first data packets are correlated to individual ones of the second data packets based upon a same parameter.