Terry,
Dave is most likely right on this one. What we typically find is the
cause on one way garbled calls is that the person not hearing the
garble, is causing it and it is almost always upstream bandwidth. If I'm
talking to someone who is garbling, it is typically caused by
something/someone else on their network uploading, either P2P or FTP are
the two usual culprits.
With proper bandwidth shaping you can run 4 g711 calls on a DSL or Cable
connection and still have ample bandwidth for other users on your
network. But to do this your going to need to have a router that
supports some sort of Bandwidth shaping/limiting. A few to look at are
M0n0wall ( http://m0n0.ch/wall ), Shorewall ( http://www.shorewall.net/
), IPCOP ( http://ipcop.org ) or pfSense ( http://www.pfsense.com/ ).
pfSense is complicated and it's shaper is still in development, but it's
full featured ( and is based on m0n0wall ).
Mike
Dave Donovan wrote:
On 4/3/07, *Terry D. Cudney* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
As near as I can determine, what they describe as
"garbled" is a jitter problem, but I'm not sure.
My setup: Linksys SPA3102 with 4 analog phones on one
extension, connected to the fsx port. I have a fairly slow DSL
connection limited to 1 Megabit down and whatever upload speed
(not sure really, but slower than down speed).
What could cause this effect?
1) My slow network connection?
There could be a number of things at play here but I can tell you I've
had the same 1 sided quality complaints and I've attributed it to the
difference in transmit and receive rates on DSL.
I had someone running a small office with a few users on Asterisk and
connecting to a VSP. People within the office could hear just fine
but the people they called were complaining that they had a bad
connection. I am pretty sure that this was caused by congestion in
our upstream DSL.
Assuming that you're using ULaw, you could try trading off a bit of
voice quality and going to a compressed codec like GSM.
Sorry I don't have any helpful advice on your echo problem.
Dave
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