Re-INVITE and Target-refresh Request Handling in the Session Initiation Protocol (SIP)

Re-INVITE and Target-refresh Request Handling in the Session Initiation Protocol (SIP) In this document, we clarify the handling of re-INVITEs in SIP. We clarify in which situations a UAS (User Agent Server) should generate a success response and in which situations a UAS should generate an error response to a re-INVITE. Additionally, we clarify issues related to target-refresh requests.