Choose assign and specify the extension numbers that are not allowed for the relevant user. In this case, all other extensions are available for all users.

Telephone integration is created for the sales and distribution department of a company. It is wise to prevent users from assigning the telephone number of the sales director. The sales director has user name Meiere and extension 4343.

Choose do not assign and specify the extension numbers that are allowed for all users. You can also allow an individual extension for a specific user thereby forbidding it for all other users, by specifying this number together with the relevant user.

Telephone integration is created for a group of two employees and 20 assistants for telephone marketing. The employees Becker and Klein have their own workplaces with telephone numbers 1818 and 1919. Four workplaces with the numbers 2323, 2424, 2525 and 2626 are available for the assistants. You want the assistants are to be able to assign themselves any one of these four numbers but to be prevented from assigning themselves the numbers of Becker and Klein.