> The question is: Is this a correct answer for that offer?
Yes.
> In case of SDP with only one "m" line, Is it mandatory
> to set the media direction attribute at the same level
> as the offer?
No; RFC 4566 section 5 applies.
The connection ("c=") and attribute ("a=") information in the
session-level section applies to all the media of that session unless
overridden by connection information or an attribute of the same name
in the media description. For instance, in the example below, each
media behaves as if it were given a "recvonly" attribute.
An example SDP description is:
v=0
o=jdoe 2890844526 2890842807 IN IP4 10.47.16.5
s=SDP Seminar
i=A Seminar on the session description protocol
u=http://www.example.com/seminars/sdp.pdf
[email protected] (Jane Doe)
c=IN IP4 224.2.17.12/127
t=2873397496 2873404696
a=recvonly
m=audio 49170 RTP/AVP 0
m=video 51372 RTP/AVP 99
a=rtpmap:99 h263-1998/90000
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