Devki Goyal

US Patent:

62158643, Apr 10, 2001

Filed:

Jan 12, 1998

Appl. No.:

9/005737

Inventors:

Devki Nandan Goyal - Glendale AZ
Nigel Henry Baker - Glendale AZ

Assignee:

AG Communication Systems Corporation - Phoenix AZ

International Classification:

H04M 342

US Classification:

379207

Abstract:

A method and system in an ISDN network for exchanging call control information between a switch and an IP, and for call set-up and call clearing for intermediate access to an IP. The invention utilizes the User-User Information (UUI) element of the Q. 931 messages to exchange call information between a switch and an IP. A subscriber call results in a connection being established to an IP. A request to the IP is encoded in the UUI element of a SETUP message, and call routing information is encoded in the UUI element of a returned DISCONNECT message. The DISCONNECT message causes a partial call release of only the circuit segments from the IP back to the switch. The circuit segments from the calling party to the switch are maintained. The switch then routes the user call to a final destination based on information contained in the UUI element of the DISCONNECT message.