Telephone subscriber unit and a semiconductor device for use in or with a telephone subscriber unit

摘要: A communication system includes a Voice over Internet Protocol (VoIP) subscriber unit coupled via modem to broadcast environment such as an (IP) network, which may be the Internet. The VoIP has input and output interface for connection being arranged transmit receive voice signals from network digital data packets. encoder/decoder convert analog packets vice-versa, encryptor/decryptor encrypt received decrypt in real time, storage medium. Encryption decryption is performed using encryption key stored semiconductor device incorporation also disclosed.