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cFos for T-Online



Setting up the T-Online Dekoder 3.0/4.0 for cFos (ISDN & DSL)

Please do note that we assume here you have cFos already installed. In addition, you should either have the "cFos modem" "cFos ISDN, Internet, Sync PPP over HDLC" or "cFos DSL, Internet, PPPoE" (for DSL) already set up.

After installation and startup of the T-Online Dekoder, go to [Settings] and click on [Connection Mode]. Select "Connection via modem or ISDN" and click [Edit] first and then [Next]. Pick a modem from the list that should appear now. Click [Next].
Select the type of phone connection. In the menu that follows, you should enter the dial-in number ("0191011" for ISDN; for DSL you are free to enter whatever number you like – e.g., "1234").
Finish the configuration process by entering all relevant connection data.

Connecting to T-Online V2.0 with cFos

Instructions on how to set up the DUN network for Windows 95/98 or the RAS for Windows NT can be found here.

When setting up an Internet connection to T-Online, a few minor settings need to be configured first:

1. Call up the DUN network and create a new entry (e.g., "T-Online ISDN").
Now disable all protocols except TCP/IP. Select "dynamic server-assigned IP address" from the TCP/IP settings.

2. You need to select "cFos ISDN, Internet, sync. PPP over HDLC." In case you haven't installed this modem yet, you must do so before you can proceed to the next step.

Please keep in mind as well that at present Windows NT RAS can manage no more than one modem by one manufacturer per COM port. This might force you to load cFos from an additional port just for RAS. However, this limitation does not apply to Windows 95/98 DUN networks.

3. Entering the connection data correctly can be a bit tricky.
So you should make absolutely sure the user name looks like it does in this example:


(Please note in this context that T-Online uses the German "Anschlusskennung" to refer to a connection's access number).

Add '#' only in case there are less than 12 digits in your T-Online number!
For instance, Anschlusskennung 000123456789, T-Online No. 0228-7999999 (the phone number 7999999 in Bonn, Germany) would produce the following user name:


The password is the "persönliche Kennwort" supplied to you by T-Online.

A more detailed installation guide with screenshots can be found at