diff --git a/README.md b/README.md
index 04345f1..3753a29 100644
--- a/README.md
+++ b/README.md
@@ -110,8 +110,16 @@ case "$1" in
 		# - T38MODEM_SIP_USERNAME
 		# - T38MODEM_SIP_PASSWORD
 		# - T38MODEM_SIP_SERVER
+		# - T38MODEM_STUN
+		
+		if [ -z ${T38MODEM_STUN+x} ]; then
+			$STUN="--stun ${T38MODEM_STUN}"
+		else
+			$STUN=""
+		fi
 
-		COMMAND="t38modem -u T38modem --ptty +/dev/ttyT38-1 --sip-proxy ${T38MODEM_SIP_USERNAME}:${T38MODEM_SIP_PASSWORD}@${T38MODEM_SIP_SERVER} --sip-register ${T38MODEM_SIP_USERNAME}@${T38MODEM_SIP_SERVER},${T38MODEM_SIP_PASSWORD} --sip-listen udp\$:5060 --route t38:.*=sip:<dn>@${T38MODEM_SIP_SERVER} --route sip:.*=t38:<dn>"
+		COMMAND="t38modem -u T38modem --ptty +/dev/ttyT38-1 --sip-proxy ${T38MODEM_SIP_USERNAME}:${T38MODEM_SIP_PASSWORD}@${T38MODEM_SIP_SERVER} --sip-register ${T38MODEM_SIP_USERNAME}@${T38MODEM_SIP_SERVER},${T38MODEM_SIP_PASSWORD} --sip-listen udp\$:5060 --route t38:.*=sip:<dn>@${T38MODEM_SIP_SERVER} --route sip:.*=t38:<dn> ${STUN}"
+		echo "${COMMAND}"
 		exec $COMMAND > /dev/null 2>&1 &
 		PID=$!
 		echo "Starting t38modem with pid $PID (pidfile /run/t38modem.pid)"
@@ -153,6 +161,7 @@ sudo chmod +x /etc/t38modem/bin/run
 T38MODEM_SIP_USERNAME="USERNAME"
 T38MODEM_SIP_PASSWORD="PASSWORD"
 T38MODEM_SIP_SERVER="voip.example.com"
+# T38MODEM_STUN="stun.example.com" # optional
 ```
 
 - Give only root access to the config
@@ -209,15 +218,44 @@ sudo systemctl start t38modem.service
 
 <hr/>
 
-## HylaFax
+## Install HylaFax
 
 - Version 6
 - `sudo apt install hylafax-server`
+
   - Set Postfix Configuration to **Local only** in dpkg-reconfigure menu
 - Run `sudo faxsetup`
+
   - Add new modem
   - Enter correct modem port (`ttyT38-1`)
   - Enter dialing configuration
   - Accept default configuration for everything else
   - It should automatically detect it to be a `T38FAX` modem
+- Look at `man sendfax` to send faxes
+- `fgetty` (the service to receive faxes) should be enabled automatically
+- Bugs:
+
+  - If you get some error about protocol errors, just let HylaFax do its thing.
+    Fax over SIP is not stable at all in my experience
+
+
+<hr/>
+
+## Cron
+
+- Alias your fax admin account as `FaxMaster` (`/etc/aliases`)
+
+```bash
+# /etc/aliases
+# [...]
+# HylaFax
+FaxMaster: $USER # replace with fax admin account
+```
+
+- Add standard tasks to crontab file: `crontab -e`
+
+```bash
+0       *       *       *       *       /usr/sbin/faxqclean
+25      23      *       *       *       sh /usr/sbin/faxcron | mail FaxMaster
+```