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3.2.1.5 Message Processing Events and Sequencing Rules

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This section follows the behavior described in endnote <167>.

No extra sequencing rules beyond those specified in [RFC3261] section 10.2.2 are required, except when a P-Preferred-Registrar header is present in the NOTIFY. If the P-Preferred-Registrar header is present, the UAC SHOULD attempt to register with the SIP registrar specified in the P-Preferred-Registrar header.