<font face="arial" size="2">
<br />
from<br /><br />
http://www.voip-info.org/wiki/view/Asterisk+sip+qualify<br /><br /></font>
<font size="2">
<font size="3">
<span style="font-family: monospace;">> qualify=xxx|no|yes</span>
</font>
<br />
>where XXX is the number of milliseconds used. If <b>yes</b> the default timeout is used, 2 seconds.
<br /><br />
>If you turn on <b>qualify</b> in the configuration of a SIP device in <a title="" href="http://www.voip-info.org/wiki/index.php?page=asterisk+config+sip.conf">sip.conf</a>, Asterisk will send a SIP <a title="" href="http://www.voip-info.org/wiki/index.php?page=sip+method+options">OPTIONS</a>
command regularly to check that the device<br />
>is still online. If the
device does not answer within the configured (or default) period (in
ms) Asterisk considers the device off-line for future calls.
<br /></font>
<font face="arial" size="2">
<br />
What happens if you use nat=yes is that Asterisk will consider the IP
for communicating with the SIP user agent (UA) as the IP from where the
SIP invite comes from instead of taking the one included in the SDP
message. Hence if you are using phones inside a LAN this 2 addresses
will be the same, but if your SIP UA is outside they will not.<br /><br />
Having all your phones set with nat=yes and qualify =yes, will not
affect the behaviour of your phones if your network is not really full,
but will be a bad and dirty way to do it :)<br /><br />Alyed</font>
<br />
<br />
<font face="Tahoma, Arial, Sans-Serif" size="2">
<hr align="center" size="2" width="100%" />Return-Path: <asterisk-users-bounces@lists.digium.com> Tue Aug 01 08:35:05 2006<br />Received: from digium-69-16-138-164.phx1.puregig.net [69.16.138.164] by mail11.webcontrolcenter.com with SMTP;<br /> Tue, 1 Aug 2006 08:35:05 -0700<br />Received: from digium-69-16-138-164.phx1.puregig.net (localhost [127.0.0.1])<br /> by lists.digium.com (Postfix) with ESMTP id A1691C3F6;<br /></font>
<br />
<br />As
far as i know qualify=yes will increase you network traffic, this will
make asterisk to communicate with all sip friends every X seconds, not
sure the default value.<br /><br /><br /><div><span class="gmail_quote">On 8/1/06,
<b class="gmail_sendername">BerkHolz, Steven</b> <<a href="mailto:StevenBerkHolz@tescogroup.com">StevenBerkHolz@tescogroup.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;"><div><div><div><span><font face="Arial" size="2">Are there any
problems with always having nat=yes and qualify=yes?</font></span></div><div><span><font face="Arial" size="2"></font></span> </div><div><span><font face="Arial" size="2">We just opened up
our server to be accessible to SIP from the internet. (used to require
VPN)</font></span></div><div><span><font face="Arial" size="2"></font></span> </div><div><span><font face="Arial" size="2">I had to set the SIP
setting for my test softphone to nat=yes and qualify=yes.</font></span></div><div><span><font face="Arial" size="2">This makes
sense.</font></span></div><div><span><font face="Arial" size="2"></font></span> </div><div><span><font face="Arial" size="2">Some of these phone
will never leave our building.</font></span></div><div><span><font face="Arial" size="2">Some of these phone
will come and go. (laptops)</font></span></div><div><span><font face="Arial" size="2"></font></span> </div><div><span><font face="Arial" size="2">Is the any negatives
to just have all phones set to nat=yes and qualify=yes?</font></span></div><div><span><font face="Arial" size="2">If not, why is it
not the default?</font></span></div><div> </div><div><p> </p><p><span style="font-size: 10pt; font-family: Arial;">Thank You,</span></p><p style="text-align: center;" align="center"><b><span style="font-size: 10pt; color: maroon; font-family: Arial;">Steven
BerkHolz</span></b><span style="font-size: 10pt; font-family: Arial;"><br />- MCSA
- MCSE -<br />Manager of Information Systems<br /><b><span style="color: maroon;">TESCO</span></b><span style="color: maroon;"> Group
Companies</span><br />Fax. 248-836-5101<br /><span style="color: maroon;"><a href="http://www.TESCOGroup.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">www.TESCOGroup.com</a></span></span></p><p style="text-align: center;" align="center"><span style="font-size: 10pt; color: black; font-family: Arial;">Board member
of<br /></span><span style="font-size: 10pt; color: rgb(153, 51, 0); font-family: Arial;"><a href="http://www.glimasoutheast.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">www.glimasoutheast.org
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