there are some instructions here:

https://freeswitch.org/confluence/display/FREESWITCH/Debian+8+Jessie#Debian8Jessie-Scriptinstallfreeswitchdemowithverto_communicator

On Nov 21, 2016, at 11:50 AM, Rajil Saraswat <rajil.s@gmail.com> wrote:

Hello,

I have been using self generated certificates (https://wiki.freeswitch.org/wiki/SIP_TLS)  until now.
Is it possible to use Letsencrypt generated certificates for TLS?

Thanks