diff --git a/README.md b/README.md
index 308fe88..6363e5c 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ How to configure this app: a plain file with SSH.
 
 For testing we can use Trickle-Ice testing tool. Go to [trickle-ice page](https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice) and enter following details.
 ```
-STUN or TURN URI : turn:<YOUR_PUBLIC_IP_ADDRESS>:5349
+TURN URI     : turn:<YOUR_PUBLIC_IP_ADDRESS>:5349
 TURN username: <YOUR_USERNAME>
 TURN password: <YOUR_PASSWORD>
 ```
diff --git a/conf/cron_coturn b/conf/cron_coturn
new file mode 100644
index 0000000..4fe0cc3
--- /dev/null
+++ b/conf/cron_coturn
@@ -0,0 +1,3 @@
+# Check if the IP as not changed at every 15th minute
+# */15 * * * * root bash /__SCRIPT_PATH__/Coturn_config_rotate.sh;
+*/15 * * * * __USER__ bash /__SCRIPT_PATH__/Coturn_config_rotate.sh;
\ No newline at end of file
diff --git a/scripts/_common.sh b/scripts/_common.sh
index b293f7c..1ab2257 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -15,7 +15,6 @@ pkg_dependencies="sqlite3 libsqlite3-dev coturn acl"
 # EXPERIMENTAL HELPERS
 #=================================================
 
-
 # Send an email to inform the administrator
 #
 # usage: ynh_send_readme_to_admin --app_message=app_message [--recipients=recipients] [--type=type]
@@ -152,4 +151,3 @@ __PRE_TAG1__$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/service
 	# Send the email to the recipients
 	cat mail_to_send | $mail_bin -a "Content-Type: $content_type; charset=UTF-8" -s "$mail_subject" "$recipients"
 }
-
diff --git a/scripts/install b/scripts/install
index 971deb1..a988000 100644
--- a/scripts/install
+++ b/scripts/install
@@ -146,6 +146,27 @@ fi
 
 ynh_store_file_checksum --file="$coturn_config_path"
 
+
+#=================================================
+# ADD SCRIPT FOR COTURN CRON
+#=================================================
+
+# WARNING : theses command are used in INSTALL, UPGRADE
+# For any update do it in all files
+script_path=/opt/yunohost/coturn
+ynh_app_setting_set --app=$app --key=script_path --value=$script_path
+mkdir $script_path
+cp ../sources/Coturn_config_rotate.sh $script_path/Coturn_config_rotate.sh
+chmod +x $script_path/Coturn_config_rotate.sh
+
+#=================================================
+# SET COTURN CRON
+#=================================================
+
+cp ../conf/cron_coturn /etc/cron.d/$app
+ynh_replace_string --match_string="__USER__" --replace_string=turnserver --target_file=/etc/cron.d/$app
+ynh_replace_string --match_string="__SCRIPT_PATH__" --replace_string=$script_path --target_file=/etc/cron.d/$app
+
 #=================================================
 # SETUP LOGROTATE
 #=================================================
diff --git a/scripts/remove b/scripts/remove
index 4212dd4..50b141c 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -22,6 +22,7 @@ turnserver_tls_port=$(ynh_app_setting_get --app=$app --key=turnserver_tls_port)
 turnserver_alt_tls_port=$(ynh_app_setting_get --app=$app --key=turnserver_alt_tls_port)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
+script_path=$(ynh_app_setting_get --app=$app --key=script_path)
 
 #=================================================
 # STANDARD REMOVE
@@ -42,7 +43,6 @@ fi
 ynh_script_progression --message="Stopping and removing the systemd service..." --weight=1
 
 # Remove the dedicated systemd config
-#ynh_remove_systemd_config
 ynh_remove_systemd_config
 
 #=================================================
@@ -71,6 +71,19 @@ ynh_script_progression --message="Removing logrotate configuration..." --weight=
 # Remove the app-specific logrotate config
 ynh_remove_logrotate
 
+#=================================================
+# REMOVE SCRIPT
+#=================================================
+
+# Remove coturn/Coturn_config_rotate.sh 
+ynh_secure_remove --file=$script_path
+
+#=================================================
+# REMOVE CRON JOB
+#=================================================
+
+ynh_secure_remove --file="/etc/cron.d/$app"
+
 #=================================================
 # CLOSE A PORT
 #=================================================
diff --git a/sources/Coturn_config_rotate.sh b/sources/Coturn_config_rotate.sh
new file mode 100644
index 0000000..9ac92e4
--- /dev/null
+++ b/sources/Coturn_config_rotate.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+source /usr/share/yunohost/helpers
+
+external_IP_line="external-ip=__IPV4__,__IPV6__"
+
+public_ip4="$(curl ip.yunohost.org)" || true
+public_ip6="$(curl ipv6.yunohost.org)" || true
+
+if [ -n "$public_ip4" ] && ynh_validate_ip4 --ip_address="$public_ip4"
+then
+    echo "external-ip=$public_ip4" >> "$coturn_config_path"
+fi
+
+if [ -n "$public_ip6" ] && ynh_validate_ip6 --ip_address="$public_ip6"
+then
+    echo "external-ip=$public_ip6" >> "$coturn_config_path"
+fi
+
+old_config_line=$(egrep "^external-ip=.*\$" "/etc/turnserver.conf")
+ynh_replace_string "^external-ip=.*\$" "$external_IP_line" "/etc/turnserver.conf"
+new_config_line=$(egrep "^external-ip=.*\$" "/etc/turnserver.conf")
+
+#setfacl -R -m user:turnserver:rX  /etc/$app_instance
+
+if [ "$old_config_line" != "$new_config_line" ]
+then
+    systemctl restart coturn.service
+fi
+
+exit 0