|[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]|
I largely agree with Jonathan.I even agree that an *ideal* solution will have the aggregated devices aware that the aggregation is present. But I think it is also important to be able to create such aggregations where only a subset of the aggregated devices are aware of the aggregation. This is just a recognition of the need to accommodate existing devices. It may be suboptimal, but still more optimal than not having the aggregation at all. For instance its easy to imagine this being orchestrated from one "smart" device and a variety of "dumb" devices. So I see 3pcc as *one* implementation, for which no additional standardization work is required. There could be additional standardization work to communicate the aggregation details among the cooperating devices.
Just in case it isn't obvious, the aggregation can occur at both ends of the call too. That is all the more reason for aggregation at one end to be hidden from the other end. The media may be disaggregated in different ways at the two ends. If each end must be aware of what is going on at the other end, then this becomes an O(n^2) problem.
Thanks, Paul Jonathan Rosenberg wrote:
Thanks for continuing to work this, Salvatore.My main comment, as others have commented, is that the draft provides a great set of use cases. However, it makes the fundamental assumption that the right way to solve this is by having multiple dialogs from user A to user B, and then have them correlated. I am *far* from convinced this is the right solution.So, focusing strictly on requirements, I'd like to see this document retitled to something like, "Requirements for Supporting Disaggregated Media", and keep the use cases, except delete the bits that suggest that the problem is multiple dialogs. For example, in section 2.1, the first two paragraphs are good, but the last two *assume* the multiple dialog solution.Other suggestions for similar use cases: * voice/video from a deskphone and application sharing from PC* voice from a deskphone and video to/from a TV attached to a set top box with a camera * the UI for the call on a mobile phone but the audio coming out of a speakerphone in a roomThere are lots more. I think the draft just should enumerate these.The requirement, then, is a mechanism which allows these use cases. I personally think that the solution should be *completely invisible* to the far end of the call. In all cases, all of the various devices under Alice's control (where Alice is the one with a multiplicity of devices) need some kind of enhancement to make this work; I would very much like to avoid the need for Bob to do *anything* to make this work. The reason is simple: its much, much easier for a user to upgrade (or their provier to upgrade) the devices under their control to get a feature that benefits them, than it is to require *everyone else* to upgrade in order to get a feature to work which benefits me.The document has this requiremnt: REQ3 UAs that do not implement the correlation mechanism and, thus, do not understand the correlation information they received should be able to handle the individual SIP dialogs that were supposed to be correlated as well as possible. That is, the correlation mechanism should not keep them from trying to handle the SIP dialogs. this is not nearly strong enough. I think the real requirement is:REQ3: The mechanism should not require any changes to the far side of the session.I also don't think 3pcc is a particularly good solution either; besides the issues raised in the threads about requiring one device to be controller and the resulting complications, it also results in a really suboptimal user experience because the slave phones think this is just a normal call when its not. As a simple example, the caller ID on one of the slave phones would probably show the controller and not the far end.As another example, consider a PC doing video and audio on the hardphone. What if the hardphone can also do video, and the user hits the video button on the phone? Most likely this creates two video streams. Ugh. Indeed, the hardphone would ideally indicate that there already WAS video in progress, but on a PC. All of this means you can't really just 'fool' the slave phone into sending media somewhere - you really want it to be much smarter about this situation and be well aware that there is disaggregated media.Thanks, Jonathan R.
_______________________________________________ Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip Use sip@xxxxxxxx for new developments of core SIP