Dear Jonathan,
Thanks for your reply. Actually I have read this paper by Tony
and Henning several times. In that paper, call setup is defined to be the
time between sending the INVITE and getting a provisional response. What I
am not sure is does this provisional response have to come from a UAS or
can it be from a stateful proxy (obviously, the call setup delay will then
be different) - perhaps either Tony or Henning can shed some light on
this.
Thanks
Victor
> >
> > Sorry if these questions seem trivial, but I wouild
> > appreciate if someone out there who know the answers could help.
> >
> > What is the definition of call setup delay in SIP? Is it
> > from the time the UAC sends the INVITE to the time it gets a
> > provisional
> > response? And does this provisional response has to be issued
> > by a UAS or
> > the one issued by a proxy will do (they will be different
> > since the one
> > issued by the proxy will reach the UAC faster)
>
> The spec does not define metrics as these. It would be the job of some other
> organization or document to define terms like "calls per second" and "call
> setup delay" as they relate to SIP.
>
> I belive call setup delay generally refers to the delay between completion
> of dial and hearing ringback. Tony Eyers and Henning Schulzrinne did some
> work to study the distribution of these delays using SIP over real networks;
> see:
>
> http://www.fokus.gmd.de/events/iptel2000/pr/signaling_talk.pdf
>
> for some definitions and results.
>
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