The ISDN lines are configured under by clicking the button ISDN lines.
- Entry active
- Enables or disables the ISDN line.
- Switching name/CO
- Name of the line. May not be identical to another line that is configured in the device.
- Comment
- Comment on the line
- ISDN/S0 bus
- ISDN interface(s) with which the device is connected to the ISDN network. The line entered here are usually configured as ISDN-TE.
- Domain name
- Domain of the "SIP world" used by the device to manage calls from and to the ISDN line.
- Call prefix
- The device places a call-prefix number in front of the caller number (CLI; SIP "From:") for all incoming calls on this ISDN line. This generates unique telephone numbers for return calls. For example; you add a number here, which the call router analyzes (and subsequently removes) to select the line to be used for the return call.
