diff --git a/README.md b/README.md
index 95a1942..7f629a1 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Linux Fax Stack using Hylafax and t38modem.
 
 This guide was created using information from the opalvoid wiki (http://wiki.opalvoip.org/index.php?n=Main.HomePage)
 
-## Softwarestack
+## Software stack
 
 ### ptlib
 (legacy) library for doing a little bit of everything.
@@ -15,9 +15,9 @@ This guide was created using information from the opalvoid wiki (http://wiki.opa
 Voice codec used by e.g. mumble.
 
 ### t38modem
-Emulates a serial modem from SIP connetion
+Emulates a serial modem from SIP connection
 
-### Hylafax
+### HylaFax
 Enterprise grade software, managing physical and emulated modems.
 
 Has some problems: https://github.com/lexbailey/compilerfax/blob/main/hylafax_is_broken
@@ -32,7 +32,7 @@ For this guide we'll use ptlib 2.18.6 and opal 3.18.6.
 #### Installing Requirements
 First we'll need some packages
 ```bash
-apt-get install build-essential git wget pkg-config libssl-dev libsrtp2-dev -y
+apt-get install build-essential git wget pkg-config libssl-dev libsrtp2-dev libspandsp-dev -y
 ```
 #### Download sourcecode
 Versions:
@@ -56,7 +56,7 @@ make install
 ```
 
 #### t38modem
-If you are getting error about `-1` not being able to be casted to a `long unsigned int` due to `-Wnarrowing` inside `dle.cxx`, you can add `-Wno-narrowing` after the `CPPFLAGS` in the Makefile to disable this error
+If you are getting error about `-1` not being able to be cast to a `long unsigned int` due to `-Wnarrowing` inside `dle.cxx`, you can add `-Wno-narrowing` after the `CPPFLAGS` in the Makefile to disable this error
 
 ```bash
 git clone https://github.com/hehol/t38modem
@@ -245,6 +245,9 @@ sudo chmod 700 -R /etc/t38modem/config/
 - Pitfalls:
   - If you are already connected to your SIP server it may not give proper response codes. My provider returns `500 Internal Server Error`
   - Test the command before running the init script!
+  - Do not try to used `ATO` to switch to a data connection, t38modem will return `ERROR`.
+  Thats hardcoded in `pmodeme.cxx` in `void ModemEngineBody::HandleCmdRest(PString &resp)`.
+  Dont let that hodld you back.
 
 ### systemd service
 If you want to run a fax server, you can create a systemd service template to let your emulated fax modem start automatically on system boot.
@@ -277,16 +280,14 @@ sudo systemctl start t38modem@XX.service
 <hr/>
 
 ## Install HylaFax
-
-- Version 6
+These instructions were tested using Hylafax version 6
 - `sudo apt install hylafax-server`
-
   - Set Postfix Configuration to **Local only** in dpkg-reconfigure menu
+## Configure HylaFax
 - Run `sudo faxsetup`
-
   - Add new modem
   - Enter correct modem port (`ttyT38-XX`)
-  - Enter dialing configuration
+  - Enter dialing configuration (see Dial Rules for Eventphone EPVPN)
   - Accept default configuration for everything else
   - It should automatically detect it to be a `T38FAX` modem
 - Look at `man sendfax` to send faxes
@@ -298,7 +299,7 @@ sudo systemctl start t38modem@XX.service
   - If your call is cleared because it `Could not find common media capabilities` t38modem may not have been able to load PTLib or Opal. Check your library paths!
 
 
-## Cron
+### Cron
 
 - Alias your fax admin account as `FaxMaster` (`/etc/aliases`)
 
@@ -316,19 +317,21 @@ FaxMaster: $USER # replace with fax admin account
 25      23      *       *       *       sh /usr/sbin/faxcron | mail FaxMaster
 ```
 
-## FaxDispatch
-
-- https://legacy.hylafax.org/content/Advanced_Permissions_with_6.0
-
-## Dial Rules for Eventphone
-
+### Dial Rules for Eventphone EPVPN
+If you want to use Eventhone EPVPN, you can apply the following dial settings onto your modems.
+You can find the config at `/etc/hylafax/config.ttyT38-1`.
+In this case `ttyT38-1` is the modem block device.
 ```
 # /etc/hylafax/config.ttyXX
 CountryCode:	1
 AreaCode:		999
 ```
 
-## TODO
+## FaxDispatch
+
+- https://legacy.hylafax.org/content/Advanced_Permissions_with_6.0
+
+# TODO
 - **TODO: Test on Debian / RockPi / RaspberryPi**
 - **TODO: Test on Eventphone Infra**
 - **TODO: Package t38modem with service files and config**