> Can anyone point me the RFC which clearly states whether a new line is
> mandatory/optional before/after every boundary line in SDP.

I'm not positive what you mean by "every boundary line in SDP".  The
boundary lines are part of a multipart body; see RFC 2046.

RFC 2046 section 5.1.1 and RFC 4566 section 9 appear to answer the
"before" part of your question.

"NOTE:  The CRLF preceding the boundary delimiter line is conceptually
attached to the boundary so that it is possible to have a part that
does not end with a CRLF (line  break).  Body parts that must be
considered to end with line breaks, therefore, must have two CRLFs
preceding the boundary delimiter line, the first of which is part of
the preceding body part, and the second of which is part of the
encapsulation boundary."

Concerning the "after" part of your question, see RFC 2046 section 5.1.1
which defines "multipart-body" and "encapsulation".
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