diff --git a/README.md b/README.md
index 0527f1e..604cc7b 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,16 @@ Install [jq](https://stedolan.github.io/jq/download/).
 
 Add your login credentials to `login_credentials_muster.sh` and rename the file to `.env`
 
+Since sipgate enforces 2FA, your usual username and password won't work anymore.
+Now, you need a so-called [Personal Access Token](https://app.sipgate.com/w0/personal-access-token), that you can retrieve after you login to the web interface.
+Enable at least the following scopes:    
+* balance:read
+* devices:callerid:read
+* devices:callerid:write
+* history:read
+* sessions:fax:write
+Enter the token-ID as `SIPUSER` or `TOKENID` and the token as `SIPPWD` or `TOKEN`.
+
 If you use Letterheads Address database, uncomment the last line of that file and add `your/path/to/Letterhead` 
 
 ## Usage
diff --git a/login_credentials_muster.sh b/login_credentials_muster.sh
index d0ac3b4..8636a9d 100755
--- a/login_credentials_muster.sh
+++ b/login_credentials_muster.sh
@@ -1,5 +1,13 @@
-#Add your sipgate username and password here:
-SIPUSER=
-SIPPWD=
+# Add your sipgate token-ID and token here:
+# TOKENID is an alias for SIPUSER
+# TOKEN is an alias for SIPPWD,
+# so for legacy reasons you can use those variables as well.
+# Take care: The SIP* variables MUST be empty/unset or contain the config to use.
+# If they are set and not empty, the corresponding TOKEN* variable is ignored.
+TOKENID=
+TOKEN=
 #uncomment if you use Letterheads Address database
 #LETTERHEAD_PATH=
+#Add your default CallerID here:
+DEFAULT_CALLER_ID="anonymous"
+LETTERHEAD_PATH="/home/bernhardt/Entwicklung/Letterhead"