On Wed, 2011-11-30 at 20:03 -0500, Adam Moffett wrote: > > You can make a pretty good prediction with ping. > "sudo ping -f -i .02 -s 180 -Q 0xb8 [ip]" gives a tolerable simulation > of voip traffic. let it run for awhile, then press ctrl+c and see how > many packets were dropped and also check the mdev number. If mdev is > low and packet loss is almost nothing then you can expect decent voice > quality. It may not be a 100% perfect test, but I'll bet you a vast > majority of the time I can do that test and tell you whether it's going > to suck. > > latency by itself with low jitter and no packet loss just means delay. > It's a matter of opinion and circumstance how tolerable delay is, but I > think your 230ms ping is at the upper edge of what most people can live > with. Much more than that and you'll be tempted to say 'over' at the > end of sentence. > > -- Fully agree,
Actually, you can do better than just a ping, but it takes some time, equipment and experience: What you can do, is adding an extra box inbetween your voip-client and voip-server, and introduce all kinds of "real-life" circumstances. I mean artificial delay, loss, resequencing, duplicating packages, reduced bandwith. We've done it some time ago as an "satelite simulator" You can build it aroud any *bsd/linux box with multiple nics. The basic idea's you can find at http://lartc.org/ If you combine it with the echo function from asterisk, you can decide for yourself what it acceptable and what not. For one of my projects i push the echo destination as the "default" sip connection to their soft phone, as i noticed that people at the other side of town regularly have a worse connection then people using umts or satelite. Main culprit (in my case) is ill-configured WIFI-setup. Latencies of over 10,000 ms and loss of 80% are daily events. And people complaining.... hw -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users