| Abstract
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Session Initiation Protocol (SIP) provides only limited space for
communicating diagnostic information when errors occur. To facilitate
troubleshooting, automated error detection, and reporting we propose
to create new protocol extensions. The extensions will be used for
richer reporting on request processing status. Particularly, we
suggest that User Agent Servers (UAS) include additional information
about error reasons in negative replies, and proxy servers indicate
in relayed requests the routing logic they used.
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