敘述
Nowadays, telephones incorporate a number of different functions. Some features such as speaker amplification, on-hook dialling, hands-free phone, memory buttons and answering machine might prove to be extremely useful.
主題（依照ISO輔具編碼）
- 多功能通信系统 (ISO 22.24.04)
- 電話配件 (ISO 22.24.21)
