The number of GTP messages received with wrong value.
It includes the following cases:
- mandatory and optional information element in the GTP
packet is duplicated, missing, unknown, incorrect or
out of order.
- the GTP message is too short to hold the GTP header for
the supported version.
- the GTP messages running an unsupported version of GTP.
- Unknown GTP message type.
Trigger Condition: This counter is triggered when a
signalling message is received with parsing related errors
such as missing/unknown/invalid/unexpected/duplicate
mandatory/optional IE's in the messages.