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Title : 6xx-Class Responses Considered Harmful in the Session Initiation Protocol (SIP)
Author(s) : D. Worley
Filename : draft-worley-6xx-considered-harmful-00.txt
Pages : 12
Date : 2007-2-26
The specification of the Session Initiation Protocol (SIP) permits a
user agent (UA) that receives a call to generate a response in the
"6xx class" that not only rejects the call but also requires the
termination of all attempts to route the call to alternative
destinations. As the call may have reached the UA through multiple
forwardings whose meanings cannot be known by the UA, the global
termination of alternative routing can only rarely be correctly
requested by the UA. Because such responses are almost never
appropriate, ability of a UA to generate such responses is harmful,
and all 6xx class responses should be replaced with 4xx class
responses with similar meanings. However, there is no 4xx class
response similar to "603 Decline", and so one needs to be created.
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