7.1 Transmission Order and Bit Definitions
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
PFCP messages shall be transmitted in network octet order starting with octet 1 with the most significant bit sent first.
The most significant bit of an octet in a PFCP message is bit 8. If a field in a PFCP message spans over several octets, the most significant bit is bit 8 of the octet with the lowest number, unless specified otherwise.