Re: [rtcweb] SDP lines (JSEP Issue 27)

[Adam Roach <[e-mail]>]

On 3/30/15 14:18, Cullen Jennings wrote:
>> On Mar 30, 2015, at 10:09 AM, Adam Roach <[e-mail]> wrote:
>>
>> i=, u=, e=, p=, z=, r=
>>   SHOULD NOT send, MUST ignore.
> I don't think MUST ignore is correct. First to be clear, I'm not saying the browser needs to do anything with the info in theses lines.
>
> I think MAY ignore or not typically used by a webrtc browser might be a better way to say it. For example, if rtcweb device was taking a streaming video session via webrtc protocols, it might make sense for it to use the i= or u= particularly if the SDP had originally come from an RTSP stream that was gatewayed to WebRTC. Similarly if a browser reported the full SDP it had received in some stats interface, I would expect it not to ignore the lines but actually report what it was it received.
>
> To be clear, I'm not saying the browser needs to do anything with the info in theses lines - it's fine to ignore them. But that's very different from all webrtc things must ignore them. (and I agree with SHOULD NOT send part)

I think we're in agreement about the principle, but might be at cross 
purposes regarding the venue: I agree that non-browsers may well have 
reasons to use these fields, but I don't think this document has much 
bearing on what those implementations do; at least, not as it currently 
describes itself.

 From the introduction section, JSEP "describes how the W3C WEBRTC 
RTCPeerConnection interface is used to control the setup, management and 
teardown of a multimedia session." So, in the context of *this* 
document, it would *appear* that we're in agreement that the proper 
normative behavior is to ignore the values in these lines. So I can see 
why we might be quibbling about "SHOULD" versus "MUST," but your 
objection seems much broader than that.

If our difference of opinion here arises from differing views about 
intended scope for the JSEP document, then we need to start a broader 
conversation around, minimally, the introduction section of the current 
draft.

/a