> [uac] sends INVITE(sdp)/200OK/Ack ---[uas] Later [uas] sends INVITE
> with header "Remote-Party-ID" ...to modify the connection; How to
> handle this re-invite scenario?

The Remote-Party-ID was introduced by an old privacy draft which did not
become an RFC.  Whoever is sending the old header might be able to tell
you which draft version is being used.

https://tools.ietf.org/wg/sip/draft-ietf-sip-privacy/


The following are some RFCs associated with the related concepts: RFC
3323, RFC 3325, RFC 5876, and RFC 4916.  However, they use different
headers.
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