Lawful intercept without mobile station international subscriber directory number

摘要

There are provided measures for lawful intercept without mobile station international subscriber directory number. Such measures exemplarily comprise a method and apparatus for activating lawful interception in a network for devices without MSISDN is provided. In particular, such measures exemplarily comprise receiving a first message comprising an external identifier, obtaining a subscriber identifier based on said external identifier, and activating lawful interception using said subscriber identifier.