Chapter 4 FortiOS Carrier : GTP identity filtering : Other identity and location based information elements
  
Other identity and location based information elements
IMSI focuses on the user, their location, and carrier network. There are other numbers used to identify different user related Information Elements (IE).
These identity and location based elements include:
• Access Point Number (APN)
• Mobile Subscriber Integrated Services Digital Network (MSISDN)
• Radio Access Technology (RAT) type
• User Location Information (ULI)
• Routing Area Identifier (RAI)
• International Mobile Equipment Identity (IMEI)