Chapter 4 FortiOS Carrier : GTP identity filtering
  
GTP identity filtering
FortiOS Carrier supports a number of filtering methods based on subscriber identity such as APN filtering, IMSI filtering, and advanced filtering.
This section includes:
IMSI on carrier networks
Other identity and location based information elements
Configuring APN filtering in FortiOS Carrier
Configuring IMSI filtering in FortiOS Carrier
Configuring advanced filtering in FortiOS Carrier