Subject: [Sip] How to respond if the request has no Call-ID

From: Prasanna <[email-masked]>
Date: Wed, 14 Aug 2002 16:17:21 +0800

Hi,
	According to RFC 3261 section 21.4.1
"The Reason-Phrase SHOULD identify the syntax problem in more detail, for
   example, "Missing Call-ID header field"."

If a request comes without a Call-ID header field, what call-ID should the
400 response bear.

The same issue is applicable for "To" "From" CSeq" headers also.

Another issue is, if a request does not bear a "Via" header, where should
the response go, if at all the UAS decides to respond.

Thanks in advance for the responses,
Regards,
Prasanna

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