Title:
IP電話システム、IP電話装置及び通話方法
Document Type and Number:
Japanese Patent JP4377741
Kind Code:
B2
Abstract:
An IP telephone system includes an IP telephone apparatus that performs voice communication via an IP network or a PSTN, a carrier that manages the voice communication performed by the IP telephone apparatus via the IP network and a server that returns a NAPTR resource record in response to a request from the IP telephone apparatus. In the IP telephone system, when the IP telephone apparatus performs the voice communication, the IP telephone apparatus transmits, to the server, a request for a NAPTR resource record corresponding to a destination IP telephone apparatus, chooses either the IP network or the PSTN as a communication path according to the received NAPTR resource record and performs the voice communication.
Inventors:
Yasuhito Kaizawa
Kazuto Kobayashi
Akira Miyajima
Kazuto Kobayashi
Akira Miyajima
Application Number:
JP2004135954A
Publication Date:
December 02, 2009
Filing Date:
April 30, 2004
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H04M3/00; H04L12/66; H04L12/70; H04L12/701; H04M7/00
Domestic Patent References:
| JP2003152892A | ||||
| JP2003283576A | ||||
| JP2004070753A | ||||
| JP2003018212A |
Foreign References:
| WO2003058900A1 |
Other References:
千村 保文,最新ネットワーク技術大系 第8回 IP電話(後編),日経バイト 第231号 Nikkei Byte,日本,日経BP社 Nikkei Business Publications,Inc.,2002年 7月22日,p.104-109
Attorney, Agent or Firm:
Koichi Washida