SIP FAQ : SIP Protocol Operation : Is there a specific order for header fields?
	Header fields can appear in any order, except within a header field type (a list of headers separated by a comma or several fields with the same name). For example, Route, Record-Route and Via need to be kept in order. Responses can re-order header fields found in the request. HTTP/1.1 says: "The order in which header fields with differing field names are received is not significant." "The order in which header fields with the same field-name are received is therefore significant to the interpretation of the combined field value, and thus a proxy MUST NOT change the order of these field values when a message is forwarded." If a set of fields is authenticated, proxies must not re-order or otherwise modify these field, as this would break the authentication.
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	hgs@cs.columbia.edu
	2001-Mar-14 5:11pm

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