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.

TID - Tunnel Identifier

In GPRS Release 97 the TID field unambiguously identifies a tunnel between a GGSN (Gateway GPRS Support Node) and a SGSN (Serving GPRS Support Node). The TID field includes the NSAPI (Network Service Access Point Identifier) and IMSI (International Mobile Subscriber Identity) values.


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

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