Kenneth Douglas English

US Patent:

54229430, Jun 6, 1995

Filed:

Sep 30, 1992

Appl. No.:

7/954189

Inventors:

Thomas M. Cooney - Lyons IL
Kenneth E. English - Naperville IL
James L. Turner - Lemont IL
Robert M. Welsh - Westmont IL
Kathleen C. Whildin - Sugar Grove IL

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

H04M 700
H04Q 1104
H04J 312

US Classification:

379225

Abstract:

Customers that have groups of stations served from multiple digital switching systems, which frequently include mixtures of PBXs and Centrex, require capabilities that will allow those station groups to operate as one global group. This invention permits customer station groups, including PBXs and Centrexes interconnected by private facilities or by the public switched telephone network (including long distance carriers), to act as a single entity that supports integrated voice and data communications. Advantageously, Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) facilities are used to carry the communications and signaling to and from the PBXs.