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Re: [MMUSIC] Draft-ietf-mmusic-rfc4566bis-05: session-level attributes

"Ali C. Begen (abegen)" <abegen@cisco.com> Mon, 11 March 2013 03:32 UTC

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From: "Ali C. Begen (abegen)" <abegen@cisco.com>
To: Brett Tate <brett@broadsoft.com>
Thread-Topic: [MMUSIC] Draft-ietf-mmusic-rfc4566bis-05: session-level attributes
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Date: Mon, 11 Mar 2013 03:32:17 +0000
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References: <C15918F2FCDA0243A7C919DA7C4BE9940CDE1808@xmb-aln-x01.cisco.com> <50E60DDF.6070204@cisco.com> <50E639D6.90105@alum.mit.edu> <C15918F2FCDA0243A7C919DA7C4BE9940CDFB627@xmb-aln-x01.cisco.com> <50E64D21.2030609@alum.mit.edu> <C15918F2FCDA0243A7C919DA7C4BE9940CF510A4@xmb-aln-x01.cisco.com> <576A8B541C219D4E9CEB1DF8C19C7B88196A2A36@MBX07.citservers.local>
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Subject: Re: [MMUSIC] Draft-ietf-mmusic-rfc4566bis-05: session-level attributes
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Hi Brett,

On Mar 10, 2013, at 10:27 AM, Brett Tate <brett@broadsoft.com> wrote:

>>>     An example SDP description is:
>>> 
>>>        v=0
>>>        o=jdoe 2890844526 2890842807 IN IP4 198.51.100.1
>>>        s=SDP Seminar
>>>        i=A Seminar on the session description protocol
>>>        u=http://www.example.com/seminars/sdp.pdf
>>>        e=j.doe@example.com (Jane Doe)
>>>        c=IN IP4 233.252.0.1/127
>>>        t=2873397496 2873404696
>>>        a=recvonly
>>>        m=audio 49170 RTP/AVP 0
>>>        m=video 51372 RTP/AVP 99
>>>        a=rtpmap:99 h263-1998/90000
>>>        a=recvonly
>>> 
>> 
>> Is not the last/second "recvonly" redundant?
> 
> 
> Yes; although is simplifies the example.  The following example/description adjustment reflects a potential change to the session level attribute.
> 
> Within the following SDP example, the "inactive" attribute applies to audio media and the "recvonly" attribute applies to video media.
> 
>       v=0
>       o=jdoe 2890844526 2890842807 IN IP4 198.51.100.1
>       s=SDP Seminar
>       i=A Seminar on the session description protocol
>       u=http://www.example.com/seminars/sdp.pdf
>       e=j.doe@example.com (Jane Doe)
>       c=IN IP4 233.252.0.1/127
>       t=2873397496 2873404696
>       a=inactive
>       m=audio 49170 RTP/AVP 0
>       m=video 51372 RTP/AVP 99
>       a=rtpmap:99 h263-1998/90000
>       a=recvonly

Yes, I like this example better. I will put this instead. 

Paul, I think this also satisfies the "more complex" example you considered.

-acbegen

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