ZyXEL Communications Prestige 100, Руководство пользователя

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68 Dial-In Configuration
However, CLID may not be available due to your switch
configuration.
Besides authentication, another application of CLID is to combine
it with call back. For instance, your company pays for the
connection charges for telecommuting employees, and you are
using the Prestige as the dial in server. You can turn on both the
CLID authentication and call back options for the dial-in users. By
doing so, all usage are charged to the company instead of the
employees, and your accounting department can avoid the hassles
of accountability and reimbursement.