Rufnummern am Mehrgeraeteanschluss
Proceed as follows:
Separately for VoIP accounts
Using the Configuration Manager (page Public switched tel. networks > VoIP > Accounts > Configure)
* Note: You will receive the settings data from the VoIP provider with whom you have set up the account.
ACCOUNT
Select the account to be displayed/configured.
PBX base number
Extensions block | from | to
Requirements:
Prefixes (country and local area code) configured for the VoIP account
A PTP connection has a PBX base number (base number, header, base phone number) and (Direct Dial In - DDI) extension numbers. The VoIP provider assigns the phone numbers for the connection. The phone number to be dialled is formed from the PBX base number + DDI number.
* Note: You can enter a zero both as a single number (e.g. 0 to 99, as is usually the case) and as a digit in the set number of places in extension numbers (e.g. 00 to 99).
* Note: If linear call distribution for the PTP connection is enabled (page Public switched tel. networks > Call distribution), and if the internal numbers match the external extension numbers, the system automatically performs a 1:1 assignment for the extension numbers in the extensions block. If an extension cannot be assigned, the fallback call distribution function is enabled.
* Note: 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).
* Note: For example,  for extensions block 0 to 99: enter extension 0 as an extension and assign it in the call distribution.
* Note: For example, for extensions block 00 to 99: Enter the individual extension numbers 00 to 09 as an extension number and assign them during call distribution.
* Note: You must enter all the extension numbers for a PTP connection that is not running linear call distribution.
Ringtone for the above-mentioned PTP connection
The ringtone specifies which sequence of sounds is used to signal external calls to the phone numbers of the PTP connection to internal subscribers on the PBX.
* Note: Individual ringtones can be assigned to extension numbers that were input in different ways.
* Note: See Ringtones for information about exceptions to signalling and sound sequences.
CLIP no screening
Requirements:
CLIP no screening service feature supported and enabled by the network provider
Type of number presentation configured for the VoIP provider In accordance with RFC 3325 with P-Asserted-Identity or In accordance with RFC 3325 with P-Preferred-Identity
The exchange line transfers the customer-specific phone number (e.g. a service phone number) entered in Phone number for CLIP no screening to the call destination without checking that this number is correct.
* Note: In Germany, some providers only offer this service feature for PTP connections. The CLIP no screening function for VoIP connections also depends on which provider is being used.
* Note: When an emergency number is dialled, the phone number received from the network provider is always transmitted, not the phone number you specified yourself.
* Note: However, the correct phone number is also still transferred to the exchange line, but this cannot be viewed by the person being called.
* Note: CLIP no screening must be enabled for every connection to ensure that the phone number for CLIP no screening is transmitted instead of the phone number received from the network provider.
Direct Dial In (DDI)
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. (Select  New to enter.) 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 VoIP account
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.
* Note: The phone number must always be configured completely, thus, with the local area code or e. g. as 0800....
Display name
This name is used for display purposes on the system phone.
* Note: If no display name has been entered, the account name is displayed.
* Note: If your provider (in Germany) is T-Online, you must also enter the VoIP phone number you received from them under Display name.
Ringtone
The ringtone specifies which sequence of sounds is used to signal external calls to internal subscribers on the PBX.
* Note: See Ringtones for information about exceptions to signalling and sound sequences.
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.
 New
Adds a new phone number.
 Delete
Deletes the entries marked in the list.