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3.7.5.2 SIP Registrar Operation

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When a SIP registrar receives a dialog creating request from a SIP endpoint, it MUST<29> check if the Contact header specifies the GRUU of the endpoint, as specified in section 3.4.5.1. If it does, it MUST check whether the SIP endpoint registration is valid and the Routable flag is set to "TRUE", as specified in [MS-SIPREGE] section 3.1.2.1. If the binding is absent or the Routable flag is set to "FALSE", it SHOULD reject the request with a 430 Flow Failed response and add a P-Dialog-Recovery-Action header field. The value of the P-Dialog-Recovery-Action indicates the actions that the source endpoint of the currently processed dialog creating the request needs to take to make processing or routing possible for requests originating from, or destined to, that endpoint. The value of the P-Dialog-Recovery-Action header field MUST be set to "Registration-Route-Set-Update, Dialog-Route-Set-Update".