To reduce a burden to be taken by a call originating side user in the case of audio communications via a packet switched network.
A communication management apparatus 1 relays mutual audio communications between data communication terminals 42 connected to respective ISP networks 4. An address specifying part 132 specifies an address for identifying a call incoming side data communication terminal 42 on the ISP network 4 to which the relevant data communication terminal 42 is connected from a telephone number of this data communication terminal 42. A communication protocol specifying part 131 specifies a communication protocol of the ISP network 4 to which the call incoming side data communication terminal 42 is connected from the telephone number of the data communication terminal 42. A GW 11 transmits audio data received from the call originating side data communication terminal 42 to the data communication terminal 42 according to the communication protocol specified by the communication protocol specifying part 131.
HORISAKA RYOJI
ISHIWATARI MASAKATSU
TANAKA HIROMI
UMEDA MASAYOSHI
