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Title : Retargeting Security in the Session Initiation Protocol (SIP)
Author(s) : Y. Xu
Filename : draft-xu-yang-retargeting-security-00.txt
Pages : 15
Date : 2007-5-11
As a SIP request is processed along its route to the destination, the
initial request-URI can be altered without callers? notice or
consent. The caller may concern both the final call recipient?s
identity and the authorities of the SIP intermediaries that alter the
request-URI. Especially when the caller does not know the final call
recipient, simply giving his/her identity to the caller will not help
the caller to decide the legitimacy of the call. Without a secure
retarget mechanism, the end-to-end security of SIP cannot be
guaranteed. This document proposes a security mechanism to provide
the caller with credentials of SIP intermediaries that retarget a
request and the final recipient?s identity through response.
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