Settings of the Extension
Proceed as follows:
• Separately for PBX base numbers
• Using the Configuration Manager (page Public switched tel. networks > ISDN > Extension numbers PTP connection)
Requirements:
• Configured PBX base number
EXTENSION NUMBERS PTP CONNECTION/BUNDLING
Select the extension number/bundle for that the extensions are to be displayed/configured, provided that more then one PBX base number was configured.
Extension (DDI number)
If you want an extension number to be different from the ones used in linear call distribution, or if an extension number is needed for a different function (e.g. remote configuration, CLIP no screening), you must also enter it in the phone number list (click on 
New). You must enter all the extension numbers for a PTP connection that is not running linear call distribution.
New). You must enter all the extension numbers for a PTP connection that is not running linear call distribution.
Note: You can input up to 250 external numbers for land line and VoIP connections in the PBX. In other words, the total maximum number of MSNs, DDI numbers and additional numbers is 250.Phone number for CLIP no screening
Requirements:
• Set up phone number
• CLIP no screening switched on for the ISDN connection
Customer-specific phone number (e.g. a service phone number) that is transferred to the destination by the exchange line without its correctness being checked.
Name
The name is used for display purposes on the system phone.
Ringtone
The ringtone specifies which sequence of sounds is used to signal external calls to internal subscribers on the PBX.
Recording on
Requirements:
• Configured voice mailbox for call recordings (page Devices > Voice mail and fax boxes > Phone numbers). In order to see the box here, no owner must be assigned to the box.
Selection of the voice mailbox, which will be used for the function Call recording.
A voice mailbox for the function Call recording can be assigned to only one connection Analogue / ISDN / VoIP.
Note: If the voice mailbox for call recordings is removed from the list (Selection of ---) and becomes a box with the function as answering machine, all recordings are deleted from this box after confirmation. Note: The function Call recording is available only in certain countries. NewAdds a new phone number.
DeleteDeletes the entries marked in the list.