Can anyone name a couple of reasonably priced or freeware tools that could help me measure the performance between two VoIP endpoints?<br><br>As far as ISPs introducing jitter to VoIP calls, can't this be solved by passing VoIP over a VPN?
<br><br>ScriptHead<br><br><br> <div><span class="gmail_quote">On 1/31/06, <b class="gmail_sendername">trixter aka Bret McDanel</b> <<a href="mailto:trixter@0xdecafbad.com">trixter@0xdecafbad.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Tue, 2006-01-31 at 16:22 -0800, Rusty Shackleford wrote:<br>> I have every reason to believe that this is exactly what is happening.<br>> Our company has some VOIP "extensions" from our IP PBX that live at the
<br>> end of Comcast cable modems. Within 3 minutes of commencing a call, the<br>> audio quality (on the upstream leg) goes to hell (it actually sounds<br>> more like packet loss). This will continue for a variable period of
<br><br>I want to reiterate that I have not read up on this so I may be wrong on<br>the legal aspects, but its my understanding the FCC has not ruled on<br>jitter inducing gear, and that its technically legal because its not
<br>blocking. The blocking is afaik only limited to ISPs that offer the<br>service themselves - to say otherwise would put ISPs that filter adult<br>content at risk. But again I havent read anything on either aspect from
<br>the FCC itself, so please dont rely on my for accuracy in this matter.<br><br>The hardware I have seen advertised is a 'black box' that ISPs can<br>install and it qill intentionally cause jitter on voice payloads and it
<br>came out just after when I heard the FCC ruled that ISPs cant block<br>VoIP. Interesting coincidence isnt it?<br><br>As I recall the case the FCC ruled on (and again I did not hear it from<br>an authoritative source but instead a friend) it was a large ISP (I want
<br>to say verizon but that may not be right) was blocking to force people<br>to use their VoIP alternative. Adding jitter to your competition can<br>have a similar effect as only that ISPs service would appear good.<br>
<br>IIRC I posted a link to the device inquestion and a news story about it<br>to either this list or to users 2-3 months ago, but I am on medication<br>right now so my memory may not be what it should.<br><br>The archives should yield more information, again google may be your
<br>friend.<br><br>Sorry for being vague about all of this, but I am not in a position to<br>research this currently, I did however want to add bits of information<br>that might be useful to help others research it and possibly find an
<br>answer.<br><br><br>There are FOSS (I believe FOSS anyway) tools to measure VoIP packet<br>performance. I think there are tools that will even do it on non VoIP<br>stuff so you can compare the difference between RTP and say some random
<br>game that uses UDP (I think it might be unfair if the packet types were<br>different as they may have different priorities for other reasons).<br>These tools may help analyze the problem and tell you if you have high<br>
amounts of jitter or dropped packets on RTP but not on something else.<br>source forge (<a href="http://sf.net">sf.net</a>) is a good resource for this.<br><br><br>--<br>Trixter <a href="http://www.0xdecafbad.com">http://www.0xdecafbad.com
</a> Bret McDanel<br>UK +44 870 340 4605 Germany +49 801 777 555 3402<br>US +1 360 207 0479 or +1 516 687 5200<br>FreeWorldDialup: 635378<br><a href="http://www.sacaug.org/">http://www.sacaug.org/</a> Sacramento Asterisk Users Group
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