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: [EMAIL PROTECTED]
Date: 2004-10-28
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