name: PCK-ID
full_form: Private Call Key Identifier
context: The purpose of key management is to establish a MCData Payload Protection Key (DPPK) for the one-to-one communication channel between the pair of communicating clients. In the case of a one-to-one communication, the DPPK shall be the PCK. The PCK is used for end-to-end protection of one-to-one (private) SDS or FD data payloads. The PCK and PCK-ID are distributed within the SIP message used to initiate the session. The PCK and PCK-ID is distributed using service-specific signalling. For all MCData services, SIP signalling is used to establish or send the MCData communication. The PCK and PCK-ID is distributed within a MIKEY payload contained within the SDP offer sent from the initiator to the receiver in the same way as for MCPTT and MCVideo. The procedures for PCK distribution are defined within clause 5.6. For off-network MCData operations, an MCData payload containing a MIKEY_SAKKE I-MESSAGE (clause 8.5.4.1) is used to distribute an MCData DPPK (PCK) from the initiating MCX client to
description: The Private Call Key Identifier (PCK-ID) is a critical network attribute for secure one-to-one communications in MCData services. It is used in conjunction with the Private Call Key (PCK) to establish end-to-end protection of private SDS or FD data payloads.
explanation: Based on the context from 3GPP TS 33.180, section 8.3, PCK-ID is classified as a Parameter because it is an essential attribute for secure communication and is distributed within SIP messages to initiate sessions.
section_title: 8.3	One-to-one communications
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