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When a UAS responds to a request with a response that establishes a
dialog (such as a 2xx to INVITE), the UAS MUST copy all Record-Route
header field values from the request into the response (including the
URIs, URI parameters, and any Record-Route header field parameters,
whether they are known or unknown to the UAS) and MUST maintain the
order of those values. The UAS MUST add a Contact header field to
the response. The Contact header field contains an address where the
UAS would like to be contacted for subsequent requests in the dialog
(which includes the ACK for a 2xx response in the case of an INVITE).
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When a UAS responds to a request with a response that establishes a
dialog (such as a 2xx to INVITE), the UAS MUST copy all Record-Route
header field values from the request into the response (including the
URIs, URI parameters, and any Record-Route header field parameters,
whether they are known or unknown to the UAS) and MUST maintain the
order of those values. The UAS MUST add a Contact header field to
the response. The Contact header field contains an address where the
UAS would like to be contacted for subsequent requests in the dialog
(which includes the ACK for a 2xx response in the case of an INVITE).
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