| 摘要 |
A conference call facility is described in which one ( 2 a) of a group of communication devices ( 2 a ,2 b ,2 c ,2 d) 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 ( 2 a ,2 b ,2 c) to the call under the control of the user of the one device ( 2 a). The users of the other devices ( 2 b ,2 c) 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 ).
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