From: "Rockson Li (zhengyli)" <[EMAIL PROTECTED]>
I think a=sendrecv should be assume if no direction attribute specified.
As per RFC4566,sec 6
a=sendrecv
...
If none of the attributes "sendonly", "recvonly", "inactive",
and "sendrecv" is present, "sendrecv" SHOULD be assumed as the
default for sessions that are not of the conference type
"broadcast" or "H332" (see below).
As Rockson says, RFC 4566 prescribes sendrecv as the default, and I
know of no statement that if a direction attribute is in the offer
that it must also be present in the answer, or a general statement
that if an attribute of a particular sort is present in the offer, an
attribute of the same sort must be present in the answer.
Dale
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