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3.4 GRUU Mechanism

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This method is based on [IETFDRAFT-OUGRUAUSIP-10] and uses the GRUU to provide an identifier that carries all of the properties, which are long-lived, distinguishes a specific instance, and routes to specific instance, defined in section 3. As described in [IETFDRAFT-OUGRUAUSIP-10] section 6, only the SIP registrar authoritative for the domain can generate the GRUU for all addresses-of-record that belong to the domain and user agents MUST use either a SIP registration procedure or some other protocol or administrative mechanism to obtain a GRUU.