A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : A Solution to the Heterogeneous Error Response
Forking Problem (HERFP) in the Session
Initiation Protocol (SIP)
Author(s) : R. Mahy
Filename : draft-mahy-sipping-herfp-fix-00.txt
Pages : 20
Date : 2005-7-11
The SIP protocol defines a role for proxy servers which can forward
requests to multiple contacts associated with a specific resource or
person. While each of these contacts is expected to send a response
of some kind, responses for each branch are not necessarily sent back
to the original requester. The proxy server forwards only the ^best^
final response back to the original request. This behavior causes a
situation known as the Herterogeneous Error Response Forking Problem
(HERFP) in which the original requester has no opportunity to see or
fix a variety of potentially repairable errors. This document
describes a backwards compatible solution to the HERFP problem for
INVITE transactions.
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