| 摘要 |
When a caller 40 wishes to make an authenticated voice or video call to a recipient 42, they first initiate a call S2 to an authentication server 36. After authenticating the caller S3 and S4, the server initiates a call to the recipient S5. When the recipient answers, the server transmits a unique identifier to the recipient's device S6, the identifier being uniquely associated with the recipient, e.g. a pre-stored recording of the recipient's voice. This allows the recipient (or the recipient's device) to authenticate the server. The server then also authenticates the recipient S7, S8 before connecting the caller to the recipient S9. In another embodiment a call identification is sent to a recipient's PC (T8, fig. 3). When the recipient takes the call on their mobile device, they check whether the call identification they hear matches that displayed on the PC. In a peer-to-peer embodiment, each user authenticates the other directly without communicating with an intermediary server.
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