Covid 19 Update: Given the current global situation, we have paused the delivery of our LiveOnsite courses, but our LiveOnline and OnlineAnytime Packages remain unaffected. Browse over 50 online courses in our course catalogue, or get in touch to register your interest in future LiveOnsite courses when we are able to safely resume in person training.

TLLI - Temporary Logical Link Identifier

The Temporary Logical Link Identifier provides a signalling address for communication between the MS (Mobile Station) and the SGSN (Serving GPRS Support Node). Three main types of TLLI exist: Local TLLI – used under normal operation between the mobile and the serving SGSN; Foreign TLLI – may be used when crossing a RA (Routing Area) boundary; Random TLLI – used for initial access or when the mobile does not possess one of the above.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

Explore NetX today with a
free trial.
More Info about NetX