In this way, not only will the scope of telephone service increase, but the digitalization of the telephone network will advance one more step towards being an Integrated Service Digital Network (ISDN).
根據計畫，屆時數位式電子交換機將增至二二三萬門，如此不僅電話第二波服務範圍擴大，電話網路數位化又向前邁進，為「整體服務數位網路」（ISDN）奠基。