I built freeswitch from the latest git on my windows machine, and it looks like transcoding from iLBC to PCMU is broken, and I hear only squeal on the line. I have only PCMU on my external profile and iLBC on my internal profiles, so no codec mismatch is possible, and all my codec settings are compatible with the devices that I&#39;m using. I inspected the traffic flow with wireshark, and there is nothing incorrect there, SIP messages and SDP is ok, and traffic looks like my device &lt;-&gt; iLBC &lt;-&gt; freeswitch &lt;-&gt; PCMU &lt;-&gt; <a href="http://voip.ms">voip.ms</a>. I&#39;ve searched around and it looks like my issue is identical to the discussion here: <a href="http://lists.freeswitch.org/pipermail/freeswitch-users/2010-October/063891.html">http://lists.freeswitch.org/pipermail/freeswitch-users/2010-October/063891.html</a>. If I run PCMU on both ends, there are no problems and if I call into freeswitch voicemail on iLBC, there are no problems either.<br>