FYI,<br><br>For posterity's sake we've researched and documented the answer to this question:<br><a href="http://wiki.freeswitch.org/wiki/SRTP#Forcing_SAVP_in_the_SDP">http://wiki.freeswitch.org/wiki/SRTP#Forcing_SAVP_in_the_SDP</a><br>
<br>Enjoy!<br><br>-MC<br><br><div class="gmail_quote">On Mon, Nov 12, 2012 at 4:55 PM, Clint Goudie-Nice <span dir="ltr"><<a href="mailto:cgoudie@callware.com" target="_blank">cgoudie@callware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US">
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<p class="MsoNormal">Greetings all,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I have been configuring a FreeSWITCH / FusionPBX system to do TLS and SRTP.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">When I configure it to do srtp in the outbound route, the SDP produced looks like:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">o=FreeSWITCH 1352745516 1352745517 IN IP4 10.16.0.131<u></u><u></u></p>
<p class="MsoNormal">s=FreeSWITCH<u></u><u></u></p>
<p class="MsoNormal">c=IN IP4 10.16.0.131<u></u><u></u></p>
<p class="MsoNormal">t=0 0<u></u><u></u></p>
<p class="MsoNormal">m=audio 22222 RTP/SAVP 9 0 8 3 101 13<u></u><u></u></p>
<p class="MsoNormal">a=rtpmap:101 telephone-event/8000<u></u><u></u></p>
<p class="MsoNormal">a=fmtp:101 0-16<u></u><u></u></p>
<p class="MsoNormal">a=crypto:1 AES_CM_128_HMAC_SHA1_32 inline:djfKObSYrk0J8pVI1w/OfQBjTYwNgTi80C68VgBB<u></u><u></u></p>
<p class="MsoNormal">a=ptime:20<u></u><u></u></p>
<p class="MsoNormal">m=audio 22222 RTP/AVP 9 0 8 3 101 13<u></u><u></u></p>
<p class="MsoNormal">a=rtpmap:101 telephone-event/8000<u></u><u></u></p>
<p class="MsoNormal">a=fmtp:101 0-16<u></u><u></u></p>
<p class="MsoNormal">a=ptime:20<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">This is great if I want to support both SRTP and non-SRTP calls; but I cannot figure out how to remove the AVP block so that SRTP is mandatory.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">How do I require SRTP?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Clint<u></u><u></u></p>
</div>
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