| 摘要 |
The IP telephony system of the present invention attains addition of advertisement information to an IP telephone set without any specific server for processing all communication information. A wireless LAN base station 10a provides an access point used for connecting a radio IP telephone set 20a to the Internet 30. An announcement information storage module 150 stores advertisement data, which is reproducible by the radio IP telephone set 20a. The IP telephony system utilizes a protocol provided by the Internet 30 and attains communication of audio information between the radio IP telephone set 20a and another device connected thereto via the Internet 30. At a preset timing in the course of communication of the audio information, the advertisement data stored in the announcement information storage module 150 is transmitted to the radio IP telephone set 20a.
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