Re: [bfcpbis] WGLC on draft-ietf-bfcpbis-sdp-ws-uri-01

Paul Kyzivat <> Tue, 15 March 2016 20:34 UTC

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Date: Tue, 15 Mar 2016 16:34:51 -0400
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Subject: Re: [bfcpbis] WGLC on draft-ietf-bfcpbis-sdp-ws-uri-01
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Generally in good shape. A few comments:

* Section 3.2 says:

    This section defines a new SDP media-level attribute, 'ws-uri' which
    can appear in any of the media lines.

But this cannot appear in any media *line*. I think you mean it can 
appear in any media *section*.

This also applies to section 3.3.

* Section 4.1:

The text here says that the *answerer* "MUST add an "a=ws-uri" or 
"a=wss-uri" attribute". But Section 4.2 admits the possibility that the 
offerer might be the server. Clearly it is the *server* side that needs 
to include "a=ws-uri" or "a=wss-uri", regardless of whether that side is 
offerer or answerer.

I can see how this might be important, such as in cases where a UAC 
sends an offerless invite to the server and the server wants to use 
BFCP. And the "client" might not be *able* to act as a web server. The 
possibility of this case should also be discussed elsewhere in the document.

Also, this section has some problems in use of terminology: The 
construct "add an ... attribute in the "m=" line of each media-line ..." 
makes no sense. Perhaps what you mean is: "add an ... attribute in the 

* Section 4.5:

It would be good to mention the use of "a=connection:existing" for 
websocket reuse.


On 3/13/16 12:55 PM, Charles Eckel (eckelcu) wrote:
> This is to announce a 2 week WGLC on the draft:
> Please review and provide any comments by Monday, March 28, 2016.
> Comments should be sent to the authors and the BFCPBIS WG list.
> If you review the draft but do not have any comments, please send a note
> to that effect as well.
> Thanks,
> Charles
> _______________________________________________
> bfcpbis mailing list