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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