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Title : Handling Large User Datagram Protocol (UDP) Responses in the Session Initiation Protocol (SIP)
Author(s) : V. Gurbani, S. Lawrence
Filename : draft-gurbani-sip-large-udp-response-00.txt
Pages : 9
Date : 2006-10-4
The Session Initiation Protocol (SIP) mandates a maximum size for any
request transmitted over UDP. This maximum is set to the lesser of
1300 bytes or the path maximum transmission unit (MTU) size minus 200
bytes. If the size of the request exceeds this maximum, SIP requires
implementations to switch the downstream transport to be a congestion
controlled transport. However, when sending a response, a SIP
implementation cannot choose the transport; it must use the transport
specified by the Via. This document discusses the problems large
responses can cause on UDP, and proposes an update to SIP to help
diagnose and avoid those problems.
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