The ISDN user settings are configured by clicking on the button ISDN users.

- Entry active
 - Activates or deactivates this entry.
 - Internal telephone number
 - Internal number of the ISDN telephone or name of the user (SIP URI).
          Note: By using the # character as a placeholder, you can use a single entry to address entire groups of numbers, e.g. when using extension numbers at a point-to-point connection.Note: User entries that use # characters to map user groups cannot be used for registration at an upstream PBX. This registration always demands a specific entry for the individual ISDN user.
 - Display name
 - Name for display on the telephone being called.
 - Comment
 - Comment on this entry.
 - MSN/DDI
 - Internal MSN that is used for this user on the internal ISDN bus.
          
- MSN: Number of the telephone connection if it is a point-to-multipoint connection.
 - DDI (Direct Dialing in): Telephone extension number if the connection is configured as a point-to-point line.
 
Note: By using the # character as a placeholder, you can use a single entry to address entire groups of numbers, e.g. when using extension numbers at a point-to-point connection.Note: User entries that use # characters to map user groups cannot be used for registration at an upstream PBX. This registration always demands a specific entry for the individual ISDN user. - ISDN/S0 bus
 - ISDN interface for the users to establish a connection.
 - En-bloc detection
 - With en-bloc dialing the device automatically detects that the dialed number is complete. A result of this is that the device places a call if it recognizes a group of digits as a contiguous block (e.g. for speed dialing). However, redialing is not an option.
 - Parallel call
 - If you use this feature, signaling occurs on all selected both ISDN lines. The call is accepted at the first telephone to pick up the call.
 - Domain/realm of PBX
 - Domain of an upstream SIP PBX when the ISDN user is to be logged in as a SIP user. The domain must be configured for a SIP PBX line in order for upstream login to be performed.
 - Authentication name
 - Name for authentication at any upstream SIP PBX when the user's domain is the same as the domain of a SIP PBX line.
 - Password
 - Password for authentication as a SIP user at any upstream SIP PBX when the user's domain is the same as the domain of a SIP PBX line. It is possible for ISDN users to log in to an upstream SIP PBX using a shared password (Standard password on the SIP PBX line).
 - Device type
 - Type of device connected.
 - Hide your telephone number from the person being called (CLIR)
 - Switches the transmission of the calling-line identifier on/off.