Siemens I-SURF - Manual (Page 52)

10. Internet access
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2. Enter the server’s area code and subscriber number (here: 01111)
This concludes the definition of the connection. You will now have to select the
correct network protocols.
3. To activate the required network protocols for this newly created connection, you
will have to change the server type. Right-click the new connection icon, and
select Properties.