Draytek Vigor 2950 - Certificate Backup; Isdn; Basic Concept

Vigor2950 Series User’s Guide
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Local certificate and Trusted CA certificate for this router can be saved within one file.
Please click Backup on the following screen to save them. If you want to set encryption
password for these certificates, please type characters in both fields of Encrypt password
and Retype password.
Also, you can use Restore to retrieve these two settings to the router whenever you want.
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ISDN means integrated services digital network that is an international communications
standard for sending voice, video, and data over digital telephone lines or normal telephone
wires.
Below shows the menu items for ISDN.