Telephonic device including a base station and at least a single handset, subscription process for the handset, the handset itself and its corresponding base station

摘要

The telephone uses handset subscription data which is encrypted and decrypted using a unique handset identification number. Base identification, authentication key and handset identification data are all stored in encrypted form in the handset in ROM (56). The handset (HS1) uses its code to decrypt the data when required.