| 摘要 |
A method of operating a cellular communications system, the method comprising a subscriber unit, e.g. mobile station or user equipment such as a mobile telephone, participating in a session context such as a session conference call that has been set up using a session initiation protocol such as Internet IP Session Initiation Protocol; a first user inputting a voice message to the subscriber unit; and the subscriber unit transmitting the voice message to a second user by means of the session context. The voice message is input on a push-to-talk basis and transmitted over a push-to- talk bearer path.
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