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Admin Guide > Configuration > Managing Telephony > Adding a SIP PBX > ICE Telephony Calls in SIP Trunk mode > Establishing secure communication between a Cisco IP Phone and CUCM > Configuring the Docker container .env file
Configuring the Docker container .env file
The Docker container .env file requires the following configuration to support TLS.
To enable TLS
1. Run the following:
ICET_CONF__tls_supported=true
ICET_CONF__preferred_signalling_protocol=”tls”
2. Run the following to ensure pjsip_acfg.json is mounted from the home folder, along with the icet.pem and icetkey.pem certificate files:
docker run
--detach \
--net=host \
--name telephony \
--env-file env \
--volume ${GATEWAY_TLS_CERT_FILE_PATH}:${GATEWAY_TLS_CERT_FILE_PATH} \
--volume ${GATEWAY_TLS_PRIVATE_KEY_FILE_PATH}:${GATEWAY_TLS_PRIVATE_KEY_FILE_PATH} \
--volume /home/iceadmin/telephony-logs:/home/telephony/icet/logs \
--volume /home/iceadmin/telephony-cores:/tmp \
--restart always \
--ulimit core=-1 \
--log-driver json-file \
--log-opt max-size=1g instantconnect/ice/gateway:3.5.7732
3. Restart the container, see the Running the Container section for the restart command.