Method for migration a network subscriber telephone connection, and a telephone network system

摘要

Method for migrating a network subscriber telephone connection (1) from a first telephone network system (N1) to a second telephone network system (N2), wherein the subscriber telephone connection (1) is associated with a subscriber telephone number (n), the migration including (suitable order):
-disconnecting the telephone connection (1) from the first network system (N1); and
-connecting the telephone connection to the second network system (N2), the method being characterized by setting a call forwarding function (CF) of the first network (N1) to forward incoming calls, calling the subscriber telephone number, to the telephone connection via the second network system (N2).