H.1 Definition
33.2203GPPGeneric Authentication Architecture (GAA)Generic Bootstrapping Architecture (GBA)TS
The Ua security protocol identifier is a string of five octets. The first octet denotes the organization which specifies the Ua security protocol. The four remaining octets denote a specific security protocol within the responsibility of the organization.
For all Ua protocols specified by 3GPP this Annex shall contain a complete list of these protocols. For Ua protocols specified by other organizations this Annex shall only specify the organization octet of the Ua security protocol identifier. Two organization octets are reserved for special use.