Isdn - Gigaset SX553 WLAN dsl First Steps

Configuring the Advanced Settings

ISDN

If you use an ISDN connection for fixed network telephony, you can enter the phone
numbers (MSN) for your extensions.
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In the Advanced Settings – Telephony menu, select ISDN.
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Enter one of the multiple subscriber numbers for your ISDN system.
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Click the Add button to add the entry to the list.
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Click the Delete button to delete the entry from the list.
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Apply the settings by clicking OK.
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