<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 17, 2014 at 10:06 PM, Nathan Anderson <span dir="ltr"><<a href="mailto:nathana@fsr.com" target="_blank">nathana@fsr.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">BUT Polycom handsets cannot be configured to just listen to RTP being multicasted to a particular multicast IP like many other IP phones can...the signalling for Polycom multicast paging and PTT functionality is completely proprietary and not SIP-based, and in fact the audio itself is not RTP. It is a proprietary audio packet format that has a header prefixed to it containing signalling information, on every audio packet/frame. Therefore nothing else can initiate a multicast page except another Polycom phone on the same layer 2 broadcast domain...you cannot programmatically have Asterisk/FreePBX do this.<br></blockquote><div><br></div><div>There is one product that I know of that is Compatible with Polycom paging. The Algo 8180 Audio Alerter.<br><br><a href="http://www.algosolutions.com/products/Audible-and-Visual-Alerting/8180-sip-audio-alerter.html">http://www.algosolutions.com/products/Audible-and-Visual-Alerting/8180-sip-audio-alerter.html</a><br><br></div><div>You can call it via SIP from asterisk and it can multicast in the special Polycom format to your phones.<br> <br></div></div><br clear="all"><br>-- <br>A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.<br>---Heinlein
</div></div>