On 24 Apr 2007, at 03:19, Chris Bagnall wrote:
Thanks for all the replies. Answering the points raised in turn:
How did you perform the speed tests?
Generally using thinkbroadband.com's speed test java applet.
On the matter of the BitTorrent factor: did you have the users
connect
the phone, and only the phone, to the Internet connection?
Yep, phone straight into the router, computers etc. all powered down.
I don't think it's the packet loss per se; it's more likely to be
jitter, and no, correcting for jitter in Asterisk isn't likely to
make
much difference, because the jitter on upstream connections can be so
big that it overwhelms the jitter buffer.
The strange thing here is that one some other sites with 2-3 users
(remote offices, etc.) where we've deployed "mini-asterisks" (Via
Epias in ITX boxes), call quality is much better even over equally
"consumer" internet connections. This makes me think that either
(or both): 1) IAX is much more tolerant than SIP; 2) Asterisk's
jitter buffering is far superior to that in any phones.
Or perhaps one of the ISP's is 'de-prioritizing' SIP and is ignorant
of IAX.
You could test this theory by having a couple of test IAX devices
(you can get them
in Tescos :-) ) or even an IAX softphone. When you get a problem user
put the
IAX device there and see if the problem goes away.
The others responding on-list are certainly giving you good
advice. I expect that
what you are suffering is unmanaged QoS at the roaming users end.
This almost
certainly will be an issue
with 256k outbound on a network connection that is not dedicated
to the voip
application alone.
I'd hoped that by insisting the users test call quality with their
computers turned off that I'd been able to eliminate this factor.
You're right of course - if there's heavy net usage going on, call
quality will plummet, but it shouldn't be an issue without other
net usage, unless I'm mistaken?
but having a router
capable of QoS at each location is an absolute necessity. I prefer
m0n0wall on a
Soekris Net4501.
Generally we use a similar setup (though with pfSense) when we're
doing small-scale remote offices with 2-4 employees. The net4801/
pfSense combo works very well in that environment.
Unfortunately I can't really mandate a mini-asterisk server and
Soekris box for each remote user - it'd add many hundreds of pounds
to the cost :-)
Hardly - Talk to [EMAIL PROTECTED] , he has a build that runs on
stock linksys routers, or
alternatively try an Nslu2.
The trick would be to keep doing what you are doing, but roll out
special measures
for difficult installs.
Tim Panton
www.mexuar.net
www.westhawk.co.uk/
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