Here you can define a list of extensions for phone lines within your IP Centrex environment. You can easily add new extensions or filter, change existing ones without any actual reconfiguration of your phone.
Branch Office extensions can only be added, deleted or modified on the Main Office self-care interface.
To add a new extension number, click the 
Add
Extension button and enter the following information:
Extension Number – Type in the number the end user will dial on his phone (an extension number should contain only digits).
Extension Name – Enter the logical name for this extension (e.g. name of the person using this line: “John”).
Office – Select an office to which the extension will be assigned. This option appears only on the Main Office self-care portal for customers with distributed infrastructure (i.e. a hierarchy of offices). The offices are displayed based on their company name. If undefined, the company name given by an administrator is used.
Assigned To Phone Line – This is the number that the extension is associated with. Here you should specify one of your phone lines by selecting it from the drop-down list. (Note that each phone line from the list can only be used once.
Primary Group - Select the hunt group to which this extension belongs to allow calls within a group to be picked up by dialing the group pickup prefix (without specifying the group number). When a user dials a group pickup prefix, the system searches for any ringing extension in their primary group.
NOTE: Make sure that you have assigned the extension to some hunt group beforehand.
Published – Clear this check box to exclude certain extensions from being accessible via dial-by-name (e.g. you do not want tele-marketers to directly reach your CEO or CFO because their names are publicly accessible).
Recorded Name – You can record or upload a voice prompt with the actual person’s name for each extension. This can be used in the Dial-by-name Directory feature. If a caller does not know the extension number of the person he is trying to reach, he may look up the called party using the first three letters of his surname.
Once all the information is entered, click the Update button.
You can easily change the number and extension name and manage phone
line assignments by simply clicking on that extension number or on
the 
Edit icon.
To remove the extension from the list, click the 
Delete button.
To search for extensions, specify their number or name and click the Search button.
To view and edit information about the extension, click the 
Configure icon next to
the extension number. You will see the Edit Extension
page (note that some fields are read-only).
