[Blink] Digest user

[Luci Stanescu]

Hi,

On 30/04/10 08:32, Emil Ivov wrote:
> It's probably worth noting that 3261 does authorize empty INVITEs. In
> such cases you simply need to send an offer in the OK, and get the
> answer in the ACK.

As simple as this might sound, it has some implications. If you're
sending me an INVITE without an SDP, it means that you'd like to
communicate with me, but you have no idea whatsover about how exactly
you'd like to communicate. Do you want to talk to me or see me? Would
you like to get a file from me or send me a file? Would you like to see
my desktop or show me yours? Or maybe you'd prefer some plain old chat.
As far as I'm concerned, I cannot possibly know what exactly it is that
you want from me. And how exactly would you expect a client receiving
such an INVITE behave? Should Blink pop-up a panel and say:

"Hey, X wants to get in touch with you, but he doesn't know how. You get
to choose the communication medium" along with some buttons:
Audio, Chat, File Transfer, Share local desktop, Request remote desktop

Even worse, after I send you a 200 OK with whatever stream(s) I choose,
you can refuse my request, but the session will already be established.
You'll have to send an ACK with the media streams I requested with 0
ports. And then one of us should close the session, right? Or shouldn't
we? After all, it's perfectly valid to have a session with all streams
closed. I think supporting this raises more questions than would be
immediately obvious.

And what applications are there for this type of session establishment?

-- 
Luci Stanescu