Configuration Manager > Overviews > Phone numbering plan
Phone numbering plan
Proceed as follows:
• Using the Configuration Manager ( Overviews > Phone numbering plan)
The phone numbering plan shows all of the internal numbers already created and any additional numbers that have been taken from the internal numbering plan:
• Subscriber phone numbers
• Group numbers
• Voice mailbox numbers
• Fax box numbers
• Phone numbers for door terminals and audio outputs
• Short-code dialling numbers
• Emergency call and service numbers
• Exchange line access numbers (account numbers) for VoIP accounts
• Exchange line access number of the PBX
• Automatic receptions
• Call parking
• Internal CAPI dial-in number
• Short-code macros
The internal numbering plan of the PBX permits the allocation of 2 to 4-digit phone numbers in the 10-9999 range. Double allocation of a number is not possible.
Using phone numbers with few digits (two or three-digit numbers) inevitably restricts the possible supply of phone numbers with more digits. For  example, if the phone number 12 is assigned, the phone numbers 120-129 and 1200-1299 are no longer available.
* Note: For some functions a 3-digit maximum phone numbers can be assigned because the last position is needed for the function (e.g. door terminal numbers, phone numbers for call parking).
* Note: The exchange line access number on the PBX is 0 in the factory settings; however, this can be changed (Public switched tel. networks > Exchange line request). Note that changing the exchange line access number restricts the phone numbering plan.
* Note: The overview can be viewed and printed ( Print) in the Configuration Manager by opening the page Overviews > Phone numbering plan.
* Note: The phone numbers can be shown in the Total overview or Grouped by type.
* Note: In the overview Grouped by type click for a type to list the configured numbers.