[Asterisk-Users] VoIP Dropouts

[Steven Critchfield]

On Wed, 2003-12-17 at 14:54, Stephen R. Besch wrote:
> I have a problem with dropouts on our VoIP calls.  I have tried two 
> different carriers, both with the similar results, although with one of 
> them, the dropouts appear to be of shorter duration.  Both the frequency 
> and duration of the dropouts vary with time of day, pointing an internet 
> traffic density as the root cause. Our local network is all 100BaseT 
> with a Gigabit backbone and Gigabit access to the public internet.
> 
> I am hoping that some of you might have some suggestions about the 
> feasibility of RTP packet routing prioritization and its implementation, 
> both on our local network and over the public internet, since 
> traceroutes indicate significant delays from time to time at all points 
> along the routing path.
> 
> This is the last hurdle to getting our phone service quality up to land 
> line quality.

While traceroute is often a good tool, a good number of routers have
been programmed to give ping replies the lowest level of priority. This
will result in certain hops seeming to be experiencing large congestion
while hops after it experience lower round trips. 

A neat tool for doing traceroute is mtr, it will run continuously for
each hop instead of the normal 3 pings and out.
-- 
Steven Critchfield  <critch at basesys.com>