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Table of Contents

FortiOS Carrier

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Basic filtering

You can use basic filtering in a GTP profile to allow or deny traffic based on APN, MCC-MNC, mode, and MSISDN. Basic filtering is also called IMSI filtering.

The International Mobile Station Identity (IMSI) is used by a GPRS Support Node (GSN) to identify a mobile station. Three elements make up every IMSI:

  • the mobile country code (MCC)
  • the mobile network code (MNC)
  • the mobile subscriber identification number (MSISDN).

The subscriber's home network—the public land mobile network (PLMN)—is identified by the IMSI prefix, formed by combining the MCC and MNC.

Basic filtering

You can use basic filtering in a GTP profile to allow or deny traffic based on APN, MCC-MNC, mode, and MSISDN. Basic filtering is also called IMSI filtering.

The International Mobile Station Identity (IMSI) is used by a GPRS Support Node (GSN) to identify a mobile station. Three elements make up every IMSI:

  • the mobile country code (MCC)
  • the mobile network code (MNC)
  • the mobile subscriber identification number (MSISDN).

The subscriber's home network—the public land mobile network (PLMN)—is identified by the IMSI prefix, formed by combining the MCC and MNC.