You&#39;ll need to manage your expectations here.<div><br><div>SIP registrations start when the client sends a REGISTER, with an expiry time. They then periodically send additional REGISTERs to remain registered. They can be spread quite a long way apart - several minutes.</div>

<div><br></div><div>A client explicitly unregisters by sending a REGISTER with a 0 expiry time, ie the registration expires immediately.</div><div><br></div><div>If the client has gone offline because of reboot, network problem etc it won&#39;t send that final REGISTER. You won&#39;t see the client unregister until the end of the expiry time when the client hasn&#39;t renewed its registration.</div>

<div><br></div><div>Since that&#39;s several minutes later, there&#39;s no way to see that they have unregistered <i>immediately</i>. You may be able to reduce the expiry time to detect they&#39;re offline quicker, but that will increase bandwidth and load.</div>

<div><br></div><div><br></div><div><br></div><div>As for actually how to detect the unregistration... I suspect the 2 events you want to listen for are sofia::unregister and sofia::expire. The names suggest the 1st will be for an explicit unregister and the 2nd for when the client fails to reregister within the expiry time. That means the 2nd&#39;ll be the one you&#39;d see if the client goes unexpectedly offline.</div>

<div><br></div><div><br></div><div>-Steve</div><div><br></div><div><br></div><div><br></div><div><br><div class="gmail_quote">On 12 December 2012 17:52, 王理 <span dir="ltr">&lt;<a href="mailto:itispip-qq@hotmail.com" target="_blank">itispip-qq@hotmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">


<div><div dir="ltr">
Hi Freeswtich Master,<div><br></div><div>I&#39;m in a situation where I need to proactively moniter whether some device/extension is on in my local network; If for some reason the devices are offline, I need to be noticed immediately so that I can restart the device;</div>

<div><br></div><div>Previously I  use xlite client to suscribe to the presence notification of the devices, but recently added some devices which not supporting presence notification, so I want FreeSwitch to send an email notification when some user/extention are getting unregistered;</div>

<div><br></div><div>How can I capture a Feeswtich user unregister event &amp; launch a LUA script then?</div><div><br></div><div>Happy days!</div><div><br></div><div>/Brgds, Alex</div> 		 	   		  </div></div>
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