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Title : Essential Correction to the Session Initiation Protocol (SIP) 503 (Service Unavailable) Response
Author(s) : I. Widjaja, V. Hilt
Filename : draft-hilt-sip-correction-503-01.txt
Pages : 11
Date : 2007-7-9
Overload occurs in the Session Initiation Protocol (SIP) when SIP
servers have insufficient resources to process all SIP messages they
receive. The SIP protocol specified in RFC 3261 provides the 503
(Service Unavailable) response code as a remedy for servers under
overload. However, the current definition of 503 (Service
Unavailable) has problems and can in fact amplify an overload
condition. This document proposes an essential correction to RFC
3261 that avoids these problems and helps SIP servers to better cope
with overload.
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