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List:       sip-implementors
Subject:    [Sip-implementors] SIP message-header order requirement for CSEQ
From:       "leon.teng"<leon.teng () utstar ! com>
Date:       2004-10-28 3:53:58
Message-ID: 200410280352.i9S3qEj26403 () szsmtp ! utstar ! com ! cn
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Dear sip-implementors:

	According to charpter 25 in rfc3261, there is no order requirement for \
message-header. Commonly, Via header will be the first header.   I suggest the CSEQ \
header should be the first message-header. There are two reasons:  1. Distribution \
consideration:   For a distribution system, a delivering engine will distribute the \
SIP messages based on the CSEQ value. If CSEQ is the first header, it will improve \
the efficiency.  2. Validity check consideration: 
	The CSEQ header can help find some invalid reponses. We no need to decode the whole \
message.     
	Can this rule be accepted as implementation guide ?



Regard 
 		leon.teng		
UTStarcom Shenzhen office
Tel: (86) 755-26952899-3539
Fax: (86) 755-26983786
Email: leon.teng@utstar.com
Date: 2004-10-28


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