Transmitting a notification to a calling subscriber during call setup to a subscriber who has been ported to another network

摘要

The invention relates to a method for setting up a call between a first and a second device in a telecommunications network supporting number portability. The method provides a calling subscriber with an indication that a called subscriber has been ported to another network and allows the calling subscriber to give instructions as to whether he wishes the call to proceed. The invention in particular enables the calling subscriber to be informed about a change in call tariff.