Section: 13.2.2.4.1 N32-f context ID
Content: The N32-f context ID is used to refer to an N32-f context. The SEPPs shall create the N32-f context ID during the N32-c negotiation and use it over N32-f to inform the receiving peer which security context to use for decryption of a received message. The initiating SEPP shall send the initiating SEPP’s N32-f context ID to the responding SEPP which the responding SEPP shall use to identify the N32-f connection with this initiating SEPP. Vice versa, the responding SEPP shall send the responding SEPP’s N32-f context ID to the initiating SEPP which the initiating SEPP shall use to identify the N32-f connection with this responding SEPP. To avoid collision of the N32-f context ID value, the SEPPs shall select the N32-f context ID as a random value during the exchange over N32-c. During transfer of application data over N32-f, the SEPP shall include the N32-f context ID in a separate IE in the metadata part of the JSON structure, see clause 13.2.4.2. The receiving SEPP shall use this information to apply the correct key and parameters during decryption and validation.