Section: 2.2A Subscription Permanent Identifier (SUPI)
Content: The SUPI is a globally unique 5G Subscription Permanent Identifier allocated to each subscriber in the 5G System. It is defined in clause 5.9.2 of 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  [119]. The SUPI is defined as: - a SUPI type: in this release of the specification, it may indicate an IMSI, a Network Specific Identifier (NSI), a Global Line Identifier (GLI) or a Global Cable Identifier (GCI); and - dependent on the value of the SUPI type: - an IMSI as defined in clause 2.1; - a Network Specific Identifier (NSI), taking the form of a Network Access Identifier (NAI) as defined in clause 28.7.2; - a Global Cable Identifier (GCI) taking the form of a NAI as defined in clause 28.15.2; - a Global Line Identifier (GLI) taking the form of an NAI as defined in clause 28.16.2. NOTE: Depending on the protocol used to convey the SUPI, the SUPI type can take different formats. See clauses 4.7.2, 4.7.3 and 4.7.4 of 3GPP TS 23.316[ Wireless and wireline convergence access support for the 5G System  (5GS) ]  [131] for details on which types of SUPI are supported by 5G-BRG, FN-BRG, 5G-CRG and FN-CRG.