| 摘要 |
A conference call facility is described in which one 2a of a group of communication devices 2a,2b,2c,2d connected to a low power radio frequency network 9 is able to set up a call to a party external of the network 9 and then selectively add further devices 2a,2b,2c to the call under the control of the user of the one device 2a. The users of the other devices 2b,2c are able to enable or disable the selection of their device in a conference call. One or more of the communication devices may be a mobile radio telephone equipped with the necessary network interface 1. |
