This setting is only relevant if the users are allowed to log on to the voice mailbox by phone.
You can set whether the "ixi-UMS Voice mailbox" should be deactivated after 3 incorrect PIN entries. In this case, the user is notified of the blocking by e-mail.
In principle, the users of each phone can log in by entering the PIN on your Voice-mailbox. Optionally, you can specify that the user does not have to enter the PIN when he logs in from his "office phone". It ist necessary the phone number must be entered in the user management in the user object in the "Telephone number" field in the format +49 8142 4838456 or +4981424838123.