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Problem description Very often, one does not have the PKr in advance, especially for peer-to-peer communication such as SIP Certificate of responder may not be known in advance Can not use MIKEY Public Key mode Responder may have different identity than one originally called Calls may be made to “group aliases”, phone numbers for hunt groups, etc. “Forking” or “retargeting” (SIP for “forwarding”) Can not predict who will answer Will result in multiple round-trips You may still want to do media encryption (sRTP) in those cases |