Siemens I-SURF - Manual (Page 38)

7. Installation and Configuration under Windows 2000
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4. You can change the MSNs for your ISDN Adapter using the Configure button:
To add a MSN to the Multi-Subscriber Numbers list, enter it in the entry field in the
middle and click Add. To delete a MSN from the Multi-Subscriber Numbers list,
select it, and click Remove.