On Fri, Oct 3, 2008 at 8:21 PM, Trixter aka Bret McDanel <trixter@0xdecafbad.com> wrote:
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.
On Fri, 2008-10-03 at 22:53 +0100, Chris Bagnall wrote:100ms on a call wouldnt matter, have you ever called someone on a mobile
> > 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.
>
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.
--
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Steve Totaro
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+12024369784 (Skype)
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