| 摘要 |
A push-to-talk over cellular (PoC) system is provided in which a negative indication-to-speak may be delivered to a requesting unit when the requested wireless unit is not available. In one embodiment of the instant invention, a first wireless unit is paged in response to receiving a request from the second wireless unit to transmit a message to the first wireless unit. A page response signal is received from the first wireless unit, and the negative indication-to-speak to the second wireless unit is delivered to the second wireless unit in response to receiving the page response signal. |
