[Freeswitch-users] Using TLS certificate with intermediate CA

Stefan gidoramothra at gmail.com
Wed Mar 24 16:29:30 UTC 2021

Hello, I also got certs from let's encrypt, and use a little script to make
freeswitch and the clients (polyphone, linphone, verto communicator)
happy. Just copy the contents of /etc/letsencrypt/live/your.host.name
to /etc/freeswitch/tls (or wherever your installation stores the certs)
and then do the following:

cat fullchain.pem privkey.pem > all.pem
ln -s all.pem tls.pem
ln -s all.pem agent.pem
ln -s all.pem wss.pem
ln -s all.pem dtls-srtp.pem

For me it works without even providing the real root ca cert, but if you
want that too, download it from letsencrypt like so:

wget -O ca.pem https://letsencrypt.org/certs/trustid-x3-root.pem.txt
cat chain.pem ca.pem > cafile.pem

Hope that works for You too. Polycoms need at least ucs v4.0.15 to
accept the letsencrypt certs (as far as I have tested it).


On Wed, Mar 24, 2021 at 11:40:30AM +0100, Thilo-Alexander Ginkel wrote:
> Hello everyone,
> I am currently struggling to get FreeSWITCH
> (1.10.5-release-17-25569c1631~64bit) to send the intermediate CA
> certificate for a Let's Encrypt X.509 certificate to be used for
> protecting SIPS traffic.
> I included the certificate chain in agent.pem:
> -- 8< --
> -----END EC PRIVATE KEY-----
> -- 8< --
> Still, clients are complaining about an invalid CA and openssl s_client
> hints at only the server cert being sent in the server hello.
> What did I miss?
> Thanks,
> Thilo

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