3.9.5.2 Incoming INVITE Processing
When an INVITE arrives at the SIP proxy authorized for the address-of-record in the Request-URI field, the proxy MUST process the request based on the preamble published for that address-of-record.
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When an INVITE arrives at the SIP proxy authorized for the address-of-record in the Request-URI field, the proxy MUST process the request based on the preamble published for that address-of-record.