Browse Prior Art Database

A VOICE OVER IP DIAL CONNECTION MECHANISM OF ISDN TELEPHONY DEVICES

IP.com Disclosure Number: IPCOM000014634D
Original Publication Date: 2001-Apr-01
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

Disclosed is a device for voice over IP (VoIP) dial connection mechanism of ISDN telephone line. For this purpose, both telephone devices need to exchange each IP address. At calling from one side, they have no dynamic IP address allocation from Internet Service Provider (ISP). ISDN line can use two logical links. This mechanism can provide VoIP dial connection. ISDN line has 2B+D. 2B means two logical links. The dialer calls to another side using one B channel as usual telephone call. After conversion session established, both telephones dial up each configured ISP for getting IP sessions with IP address allocation. Both ISPs provide IP address for each. In this time, one side may be in Japan and another one may be in Germany. But usual dial up must be the domestic local telephone call. After both telephone devices can get IP address from ISP, they exchange IP address each others. The telephone device can call to other using VoIP via Internet. After VoIP session established, the telephone devices disconnect the usual telephone session and switch the voice conversion to VoIP session. This can enable the long distance telephone call with low telephone charge. 1