name: SPK
full_form: SIP Protection Key
context: Floor control, transmission control, and media control between MCX servers may need to be protected. Additionally, certain values and identifiers transferred in the signalling plane between servers within an MC domain, or between MC domains, may be treated as sensitive by public safety users and therefore may also require protection. To protect information from all other entities outside of the MC domain(s), a shared 128-bit Signalling Protection Key (SPK) needs to be established between the servers. The SPK is provided along with a 32-bit identifier, the SPK-ID and 128-bit random value SPK-RAND. The most significant four bits of the identifier (the Purpose Tag) of the SPK-ID shall be '3' to denote the purpose of the SPK is for signalling protection, as described in Annex G. The SPK and associated values shall be directly provisioned into the communicating servers, along with the SPK-ID. With the SPK provisioned, RTCP and XML content (within SIP) may be protected.
description: The Signalling Protection Key (SPK) is a critical network attribute used for protecting sensitive information exchanged between MCX servers in an MC domain or across different domains. It is a shared 128-bit key established between the servers to ensure confidentiality and integrity of signalling data.
explanation: The context explicitly mentions that SPK is a 'shared 128-bit Signalling Protection Key' used for protecting sensitive information, which aligns with the definition of a Parameter in the telecommunications domain. The detailed description of its usage and provisioning further supports this classification.
section_title: 5.5	Key management between MCX servers (SPK)
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biotag_Description: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,B-Message,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O