Alex,
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).
And you can check the example of RFC4317 , many answer of them has no
a=sendrecv, which is assumed.
Regards,
-Rockson
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Friday, July 04, 2008 2:47 PM
To: [EMAIL PROTECTED]; [email protected]
Subject: Re: [Sip-implementors] a=sendrecv in SDP answer
For UAS, whether or not the SDP offer without a=sendrecv is processed as
sendrecv?
In our UAS implementation, if the incoming non-initial SDP offer carrys
no direction attribute, it will be regarded as no mode requirement. I
think it is incompliant to the RFC3264.
Alex Zhang
ESN: 6-554-8782
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Arun Arora
Sent: Friday, July 04, 2008 12:29 PM
To: [email protected]
Subject: Re: [Sip-implementors] a=sendrecv in SDP answer
No, it can't be done this way. By adding a=sendrerv we are clearly
distinguishing b/w RFC 2543 and RFC 3261. So, For an "a=sendrecv" there
has to be an "a" attribute in the answer.
Arun
--- On Fri, 4/7/08, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
From: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Subject: [Sip-implementors] a=sendrecv in SDP answer
To: [email protected]
Date: Friday, 4 July, 2008, 7:04 AM
RFC3261 - 6.1, pargraph 4:
"If an offered media stream is
listed as sendrecv (or if there is no direction attribute at the
media or session level, in which case the stream is sendrecv by
default), the corresponding stream in the answer MAY be marked as
sendonly, recvonly, sendrecv, or inactive."
My question is that: If the SDP offer contains the a=sendrecv, can the
SDP answer omit the a= line to represent the default value, i.e:
Offer (a=sendrecv) ---->
<--- Answer(no a=sendrecv line )
Thanks,
Alex
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