| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an IP conference telephone system suitable to an IP-PBX system. SOLUTION: A call control unit 28 connected to an IP network 10 sets a conference connection to telephone sets Tel1, Tel2 or Tel3 contained in the IP network 10. The telephone sets Tel1, Tel2 and Tel3 in which the conference connection is set transmit a packet of a sound signal to the network 10 by addressing it to a conference trunk 24. Receiving the packet from the network 10, an IP bridge 22 connected to the IP network 10 multiplies the sound signal to a channel corresponding to telephone sets Tel1, Tel2 and Tel3 of an outgoing highway 18B and transmits it to the conference trunk 24. Receiving the sound signal from the telephone sets Tel1, Tel2 and Tel3, the conference trunk 24 adds and subtracts this and returns it to a highway 18F. In the other embodyment, a multicast rooter 70 is disposed instead of the conference trunk 24 and the IP network 10a corresponding to the multicast performs multicast to the telephone sets Tel1, Tel2 and Tel3 which are conference registered. Thus, conference speech is performed among the telephone sets Tel1, Tel2 and Tel3.</p> |
