[asterisk-biz] Colocated Asterisk Server

[Steve Totaro]

On Fri, Oct 3, 2008 at 8:21 PM, Trixter aka Bret McDanel <
trixter at 0xdecafbad.com> wrote:

> On Fri, 2008-10-03 at 22:53 +0100, Chris Bagnall wrote:
> > > Well, that's not necessarily true.  Yes, of course you're going to add
> > > some latency, but it doesn't have to be too much.  It all depends on
> how
> > > the US data center is peered.  If it's peered with primarily Tier 1
> > > backbones that privately haul trans-Atlantic traffic and go back to
> > > LINX, Redbus, etc. in London, you're pretty well off.
> >
> > I was thinking specifically of the scenario where one might have PSTN
> termination in the UK, customers in the UK, but phone servers in the US.
> You'd have the latency of the customer's (usually *DSL) connection to the
> US, then the (hopefully much lower) latency back to the PSTN provider in the
> UK. I doubt you'd be able to do it under 100ms end-to-end.
> >
> > As you rightly point out, if you can sidestep handling media, the
> situation would be much improved.
> >
>
> 100ms on a call wouldnt matter, have you ever called someone on a mobile
> that was right next to you?  The delay is usually noticeable.  Its loss
> and jitter that would be problems.  As long as those are under control,
> then the call quality should be good.  I have regularly made calls from
> Amsterdam to servers in the US and the audio was crystal clear and delay
> was not observable in a normal conversation.
>
>
> --
> Trixter http://www.0xdecafbad.com     Bret McDanel
> Belfast +44 28 9099 6461        US +1 516 687 5200
> http://www.trxtel.com the phone company that pays you!
>

200ms and under is what I like to see.

Ditto on a an IAX2 call to Uganda from Washington DC.  Low bandwidth with
VSAT no doubt, best ping times were ~900ms so we used Speex (ulaw and even
gsm were breaking up) and Uganda had some kind of crazy double NAT so we
used IAX2 since OpenVPN's downside is a slight increase in latency.

The calls were very clear but the latency was so bad you had to get used to
it or you would keep talking over each other, kind of like the reporters
doing statallite reporting half way around the world.

This was before Uganda allowed VoIP so it sure as heck beat the cost of a
landline call (or even a specialized calling card) but you just had to deal
with the lag, which, with some practice is not a deal breaker.

-- 
Thanks,
Steve Totaro
+18887771888 (Toll Free)
+12409381212 (Cell)
+12024369784 (Skype)
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