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List:       sip-implementors
Subject:    [Sip-implementors] Meaning of zero "m=" line in sdp ????
From:       "prathap" <prathap () acmet ! com>
Date:       2003-06-23 4:54:28
Message-ID: 000001c33943$8767e170$e100a8c0 () prathap
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Hello all,

RFC 3264 An Offer/Answer Model Session Description Protocol   June 2002

"For each "m=" line in the offer, there MUST be a corresponding "m="
  line in the answer.  The answer MUST contain exactly the same number
  of "m=" lines as the offer.  This allows for streams to be matched up
  based on their order.  This implies that if the offer contained zero
  "m=" lines, the answer MUST contain zero "m=" lines. "

from above paragraph 
"This implies that if the offer contained zero "m=" lines, the answer
MUST contain zero "m=" lines."

I don't understand what is zero "m=" line.
Is it try to mean without "m=" line in sdp message ???

If it is without "m=" line then sdp is invalid.
Since "m=" line is mandatory as per the RFC 2327

What is mean by zero "m=" line ?
Please clarify the above.

Prathap





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