<div><div>Nick,</div></div><div><br></div><div>When people inquire about "VoIP quality" that usually means voice quality. As Bogdan indicated this is outside Opensips' influence.</div><div><br></div><div>In most cases you'll want to make sure RTP media is marked with Diffserv EF. This allows the routers on a suitably configured network to identify the voice traffic in a standards-compliant way and prioritize it ahead of other, less time sensitive traffic. In my Opensips configurations I use "tos=0x68" to set my SIP packets to a Diffserv value of AF31.</div>
<div><br></div><div>Exactly how priority queueing is achieved on a network device is entirely dependent upon the network device. Cisco will look very different from Juniper which is completely different than Linux 'tc', etc.</div>
<div><br></div>True end-to-end guaranteed QoS requires that you control the network from one end all the way to the other. Or, at the very least, it requires that you subscribe to services from carriers that include queueing and prioritization in a way that is compatible with your traffic. Turning this around, there is no way to guarantee QoS across the internet, although there are things you can do locally to help the cause, so to speak. This amounts to local traffic shaping and queueing mostly.<div>
<br></div><div>In summary, VoIP quality is more a function of the network and less a function of any application or device running on the network.</div><div><br></div><div><br></div><div>- Jeff <br>
<br><br><div class="gmail_quote">On Fri, Dec 14, 2012 at 9:18 AM, Bogdan-Andrei Iancu <span dir="ltr"><<a href="mailto:bogdan@opensips.org" target="_blank">bogdan@opensips.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u>
<div bgcolor="#ffffff" text="#000000">
<tt>Hi Nick,<br>
<br>
OpenSIPS does only SIP, so it does not do media qos.<br>
<br>
Regards,<br>
</tt>
<pre cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a href="http://www.opensips-solutions.com" target="_blank">http://www.opensips-solutions.com</a></pre><div><div class="h5">
<br>
On 12/14/2012 10:10 AM, Nick Chang wrote:
</div></div><blockquote type="cite"><div><div class="h5">
<div>
<p class="MsoNormal"><span lang="EN-US">Hello<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I saw this url. <a href="http://www.voip-info.org/wiki/view/QoS" target="_blank">http://www.voip-info.org/wiki/view/QoS</a><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Opensips have a module
with qos.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">How to guarantee a voip
Quality??<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
</div>
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</blockquote>
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