<div dir="ltr"><div><div><div><div>I'd say QoS drops even more abruptly if you hit the bandwidth or performance limits.<br><br></div>tshark, a text terminal version of Wireshark, can analyze the quality of RTP streams and print a report that you can parse. Keep in mind that the analysis itself is quite CPU-intensive, so what I usually do is collect the RTP streams with tcpdump, and then run tshark in low-priority mode.<br><br></div>Here in scripts/ you can find a simple script that launches tshark and analyses the output:<br><a href="https://github.com/voxserv/voip_qos_probe">https://github.com/voxserv/voip_qos_probe</a><br><br></div>There is also a library for comparing WAV streams -- this would be the best for QoS measurements, and you would also be able to get the PSTN path into the test. But I didn't yet try it, as the customer was satisfied with RTP analysis:<br><a href="http://openpreservation.org/knowledge/blogs/2012/07/09/xcorrsound-waveform-compare-new-audio-quality-assurance-tool/">http://openpreservation.org/knowledge/blogs/2012/07/09/xcorrsound-waveform-compare-new-audio-quality-assurance-tool/</a><br><a href="https://github.com/openpreserve/scape-xcorrsound">https://github.com/openpreserve/scape-xcorrsound</a><br><br></div>I hope this helps :)<br><div><br><br><br><div><br><div><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 25, 2015 at 1:35 AM, Andrew V <span dir="ltr"><<a href="mailto:avstarventures@gmail.com" target="_blank">avstarventures@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>How do you measure quality of service across all calls?</div><div>What are ways to avoid bad quality of service?</div><div>Say the call volume is in your control.</div><div>Is it as easy as not letting the call volume get out of control?</div><div>The attached is a hypothesis of the relationship between QOS and the number of concurrent calls. Does it work that way?</div><div>What other factors need to be taken into account?</div><div><br></div><div><img src="cid:ii_14bbe24a2109a3c7" alt="Inline image 1" height="310" width="394"><br></div><div><br></div></div>
<br>_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
<a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
<a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
<br>
FreeSWITCH-users mailing list<br>
<a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
<a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br></blockquote></div><br></div>