scope:

This European Telecommunication Standard (ETS) specifies the Trace facility for GSM where it refers to: - subscriber tracing (tracing of International Mobile Subscriber Identity (IMSI)); - equipment tracing (tracing of International Mobile station Equipment Identity (IMEI)). It does not cover: - types of trace which relate more to network elements than to individual subscribers e.g. tracing events within a Base Station System (BSS), and so on; - tracing of all possible parties in e.g. a multi-party call. It also refers only to tracing activated from the OSF and not to that activated by means of local Man Machine Interface (MMI).