From the beginning I found the early-session technique "interesting".
The problem I have with it is believing that people will attempt to
implement it, and if they do, that they will implement it correctly.
Given the amount of trouble that people seem to have implementing the
full o/a mechanism correctly, who likely is it that they will get it
right when trying to simultaneously manage two independent o/a
negotiations, most likely with the o/a role swapped between them, and
all multiplexed over the same invite. Its possible, but I'd like to hear
about it being tested at sipit.
Thanks,
Paul
wang.libo@xxxxxxxxxx wrote:
Hi,
Brett Tate has listed some.
Also:
o. Services can be supplied with fewer messages.It helps lighten the
servers stress.
o. You can recognize the session for the tone easily.
o. It's useful for services such as CF(call forward),in which case there
may be several early diologs.
Regards,
Eric
> > Do you find some advantage to it over simply using early media
> > with a different to-tag?
>
> It allows the early media session and answered media session to be
> negotiated prior to INVITE 2xx. The main benefit is to reduce
> clipping upon INVITE 2xx if forking has occurred and all UAS
> actually support early-session.
>
> More specifically, UAS may assume only answered media will be sent
> to the port for answer; thus it could quickly start rendering
> answered media prior to receiving INVITE 2xx. UAC can allocate
> other ports for early media; or it can refuse or hold early media
> without it subsequently delaying answered media (by requiring
> another offer/answer exchange).
>
> Works good in theory if all user-agents support it. I have no idea
> how well it works in the real world. :)
>
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