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Title : Classifying Response Codes to Support Multiple Path Routing in the Session Initiation Protocol (SIP)
Author(s) : D. Worley
Filename : draft-worley-redundancy-response-00.txt
Pages : 20
Date : 2007-2-21
An increasing number of SIP architectures implement multiple path
routing (MPR), which is the providing of more than one path for a
call to reach a destination user agent (UA). To implement MPR well,
the proxy which forks a request onto the paths needs to be able to
determine if a fork that failed reached the destination UA and was
rejected by the UA (and so an alternate path should not be tried), or
if the fork failed before reaching the UA (and so an alternate path
should be attempted). In order that the proxy can distinguish these
two situations, response codes should unambiguously identify which of
these situations applies. This Internet-Draft begins classifying the
current usage of response codes, their implications for MPR, and
possible improvements.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-worley-redundancy-response-00.txt
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