GTP Policy

GTP-C messages can include multiple IEs, for example:

• Access Point Name (APN)

  Indicates the name of the access point, which identifies a specified external network and the ISP of a service on the GGSN. On the SGSN, the IP address of the GGSN corresponding to the APN can be obtained through DNS resolution.

• International Mobile Subscriber Identity (IMSI)

  Indicates the international mobile subscriber identity to differentiate mobile subscribers. IMSI comprises Mobile Country Code (MCC), Mobile Network Code (MNC), and Mobile Subscriber Identification Number (MSIN). MCC and MNC constitute the prefix of IMSI to identify the local network or PLMN of mobile subscribers.

• Mobile Station International ISDN Number (MSISDN)

  Indicates the mobile station international ISDN number to identify the number that the PSTN or ISDN dials to the GSM system.

• Routing Area Identity (RAI)

  Indicates the routing area identity to identify the attribute of the SGSN, including the MCC and MNC.

The Eudemon supports the filtering of GTP packets based on the combination of the APN, IMSI prefix, MSISDN, and RAI prefix.