name: ICID
full_form: IMS Charging Identifier
context: The IMS domain correlation is based on IMS Charging Identifier (ICID) shared between IMS Network Elements involved with the same session/transaction. With ICID it is possible to correlate session/transaction related charging data generated in different IMS elements (i.e. x-CSCFs, ASs'). The ICID is included in all SIP methods, if the P-Charging-Vector header is present, and transferred through originating and terminating side nodes, except to UE. The value of the ICID parameter is identical with the 'icid-value' parameter defined in TS 24.229 [106] and is included within The P-Charging-Vector. The ICID value is globally unique across all 3GPP IMS networks for a time period of at least one month. The ICID is generated within the first IMS Network Element and present within the SIP request(s) and SIP response(s). For SIP session unrelated methods session unrelated ICID is generated for a specific SIP transaction. For SIP session related methods the ICID is generated for the initial
description: The IMS Charging Identifier (ICID) is a parameter used in the IMS domain to correlate charging data generated in different IMS elements, such as x-CSCFs and ASs. It is included in all SIP methods if the P-Charging-Vector header is present and transferred through originating and terminating side nodes, except to UE.
explanation: The context explicitly states that ICID is a parameter used for correlation of charging data, which justifies its classification as a Parameter.
section_title: 4.4.3.1IMS Charging Identifier (ICID)
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