I am running the latest version of freeswitch-stable from the deb
repository on Debian 8 .... just like you recommend in the docs. ;-)

The default config it installs seems to take issue with the following files :

sip_profiles/internal.xml
sip_profiles/external-ipv6.xml
sip_profiles/external.xml

More specifically the line

<param name="tls-verify-policy" value="none"/>


Someone seems to have asked this question before

http://lists.freeswitch.org/pipermail/freeswitch-users/2015-July/114881.html

But nobody seems to have given an answer at the time !

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