I my experience it means that the identity of the connected party has changed.
say you have a SIP gateway to some non-SIP network. If a transfer occurs inside the network then the SIP endpoint could become connected to a different user. The SIP UA will update the P-Preferred-Identity from RFC 3325: 9.2 The P-Preferred-Identity Header The P-Preferred-Identity header field is used from a user agent to a trusted proxy to carry the identity the user sending the SIP message wishes to be used for the P-Asserted-Header field value that the trusted element will insert. LATER IN THE SAME SECTION... It is worth noting that proxies can (and will) remove this header field. Then I think the proxy will remove P-Preferred-Identity and replace it with a P-Asserted-Identity to propagate the new identity. >From RFC 3325: 9.1 The P-Asserted-Identity Header The P-Asserted-Identity header field is used among trusted SIP entities (typically intermediaries) to carry the identity of the user sending a SIP message as it was verified by authentication. LATER IN THE SAME SECTION... It is worth noting that proxies can (and will) add and remove this header field. regards Attila -----Original Message----- From: [email protected] on behalf of Jyoti Singhal Sent: Thu 10/03/2011 05:29 To: [email protected] Subject: [Sip-implementors] Significance of different PAID header inRe-INVITE Hi All, I need to know is there any significance of a modified PAID header in Re-INVITE. With Regards, Jyoti _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
