Title:
携帯電話での同報通話システム
Document Type and Number:
Japanese Patent JP4352138
Kind Code:
B2
Abstract:
A multicast system includes a multicast device and a communication terminal such as a mobile phone. The mobile phone has a switch, and voice information can be transmitted only while the switch is on. When the voice information is multicast to a plurality of mobile phones, the mobile phone in question transmits the telephone numbers of the plurality of mobile phones to which the voice information is to be multicast, and a group code which specifies the group of the mobile phones, to the multicast device via a network. The multicast device stores, in a storage unit, the group code and the telephone numbers of the mobile phones included in the group, and at the same time, multicasts the received voice information to these mobile phones.
Inventors:
Izumi Shima
Application Number:
JP2003334999A
Publication Date:
October 28, 2009
Filing Date:
September 26, 2003
Export Citation:
Assignee:
NEC
International Classes:
H04M3/42; H04B7/26; H04L12/18; H04M3/56; H04W4/06; H04W4/08; H04W4/10; H04W88/02
Domestic Patent References:
| JP63185275A | ||||
| JP2004535097A | ||||
| JP2001177465A |
Foreign References:
| WO2002085051A1 |
Attorney, Agent or Firm:
Masahiko Desk
Akitaka Kimura
Toshio Asai
Akitaka Kimura
Toshio Asai