ISDN Line

Use this screen to set up the ISDN line you use to make regular phone calls. Each field is described in the following table.

Label
Description
ISDN Line Pre-fix Number
Enter 1 - 7 numbers you dial before you dial the phone number, if you want to make a regular phone call while one of your SIP accounts is registered. These numbers tell the ZyXEL Device that you want to make a regular phone call.
Relay to ISDN Line
Enter phone numbers (for regular calls, not VoIP calls) that you want to dial without the prefix number. For example, you should enter emergency numbers.
The number (1 - 9) is not a speed-dial number. It is just a sequential value that is not associated with any phone number.
Apply
Click this to save your changes and to apply them to the ZyXEL Device.
Cancel
Click this to set every field in this screen to its last-saved value.