| 摘要 |
<p>Transceivers (31 a; 71) for transmitting and/or receiving cipher data to/from other tranceivers (31 b, 51; 31) in end-to-end encrypted communication over a mobile network, and methods for transmitting and receiving in such communication. The mobile network (7) is of a type supporting real-time multimedia communication, such as video telephony, with transparency of multimedia data being communicated. Preferably the mobile network is a cellular UMTS network. Cipher data is being sent/received through a circuit switched multimedia bearer service of the mobile network (7), the bearer service being reserved in the mobile network (7) for multimedia communication. Preferably the multimedia bearer service is UMTS service BS30 transparent for Multimedia.</p> |
