| 摘要 |
<p>Such comprising the intrinsic cooperation between a messages concentration unit, a central operating unit, various display screens, printers, information storage devices including operating and management software, in order that modular telephones and validation and identification units and access units, together with the regional invoicing centres and the validation and invoicing centre, and the terminals of collector firms, by exchanging various specific operating messages within the modular public telephone management system, control all the context and operations stemming from their performance. <IMAGE></p> |
