[SIPForum-techwg] Question about early dialog

[Johansson Olle E]

7 nov 2007 kl. 03.14 skrev Robert Sparks:

> Yes, you create an early dialog for each of the remote tags you  
> receive.
>
> Each of these early dialogs may be involved in subsequent signaling
> or media
> before a 200 OK happens (preconditions or early media). You don't
> know until
> you get that 200 which one will ultimately complete, so you must keep
> them all
> going.
>
> And you may well get more than one 200 (its a race condition, but it
> can occur).

The really interesting bit is receiving multiple 183 early media from
different servers - and then a 200 OK from yet another server...

The behaviour of endpoints in this scenario varies quite a lot, as
proven on SIPit in Antwerp...

/O