Telephone switching systems

A computer program product comprising a computer-readable medium having computer readable instructions recorded thereon, the computer readable instructions being operative, when executed by a processor of computerized device, to cause the computerized device to perform a method for generating configuration data for use in the migration of subscribers from a first telephone switching system over to a second telephone switching system in a telecommunications network, each subscriber having an associated telephone channel and a telephone dialing number for telephone calls conducted via the first telephone switching system, the method comprising:

• monitoring signaling information on telephone channels associated with the subscribers for telephone calls conducted via the first telephone switching system;
• analyzing the monitored signaling information in relation to call data produced by the first telephone switching system for the calls to identify a relationship between the monitored signaling information and the call data for a call conducted by a subscriber;
• and
• storing configuration data based on the identified relationship, the configuration data being for configuring the second telephone switching system with a mapping between the associated telephone channel and the telephone dialing number for the subscriber.