GTP logs include event codes to help you troubleshoot issues. A single GTP event type can have more than one event code, and you can find this detail in each log. When a GTP session ends, for example, while the GTP event type is recorded as GTP session end, the event code can be 841 or 844. The event code description below will help you decipher whether the session end was triggered with a Delete message or the session terminated unexpectedly. The event codes are in hexadecimal format, where xx is the message type, yy is the Information Element (IE) type, and z is the GTP version.