| 摘要 |
The mobile phone switchboard is a central unit, which operates as a mobile phone which is attached to other internal units 1, 2, 3, . . . 9 or more. It is similar to the usual mobile phone handsets and it is equipped with 4 illuminating lights (Inq., Tran., I, II). With the mobile phone switchboard it becomes possible to third party to operate mobile phones. (such as disabled people or even more children and so on), with controlled operation costs. At anytime parents are able to communicate with their children and vice versa, with controlled cost via the central unit. Additionally the mobile phone switchboard has the following specifications:1. Modification of the central unit to operate in Direct Inward Dialing (D.I.D.) for higher benefit of the mobile phone network.2. Call transfer to other telephone units/numbers.3. Simultaneous conversation with several calls.
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