P.S.
Outside of localised, low-activity LAN segments at close proximity,
running VoIP over 802.11b/g/n-style wireless is generally considered a
bad idea among serious network engineers.
It's a topic of fierce debate, though, since there are some narrowly
conceived business models out there that hinge on VoIP framed over small
802.11g wireless sectors and point-to-point 802.11 backhauls and stuff
like that. On the other hand, VoIP over WiMax networks like CLEAR in
the US has generally received positive appraisals.
On 04/06/2010 08:23 PM, Alex Balashov wrote:
Latency is not in itself an impediment to a successful VoIP
conversation; latency is just uncustomary for humans, and causes them
to talk over each other not unlike satellite or microwave long-distance
telephone conversations between hemispheres.
The problem that is often present in connection with the underlying
causes of high latency but is a different phenomenon than latency is
jitter. Jitter is the presence of nonlinear temporal deltas between the
arrival of RTP packets. RTP arrival at non-constant intervals causes
audio distortion, "drop-outs," static, repetition, and stream
synchronisation problems.
The bottom line: if there is high but very constant latency, you can
still have a manageable conversation. However, the same things that
cause high latency -- for example, link congestion -- often cause
jitter. The degree of packet queue saturation and/or bandwidth
exhaustion often varies across time and creates stochastic,
indeterminate effects that jitter buffers cannot be designed around, and
certainly not perfectly at any rate.
I would bet that jitter is the cause of your problem, simply because it
often goes hand-in-hand with latency.
--
Alex Balashov - Principal
Evariste Systems LLC
1170 Peachtree Street
12th Floor, Suite 1200
Atlanta, GA 30309
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/
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