Telephonic communications – Plural exchange network or interconnection – Multi-pbx interconnection
Patent
1992-09-30
1995-06-06
Dwyer, James L.
Telephonic communications
Plural exchange network or interconnection
Multi-pbx interconnection
370 581, 3701101, 379220, 379224, 379229, 379230, 379231, 379234, H04M 700, H04Q 1104, H04J 312
Patent
active
054229430
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.
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patent: 5305312 (1994-04-01), Fornek et al.
D. Bushaus, "Users Eye PRI ISDN", Communications Week, Mar. 4, 1991, p. 28.
C. Roeckl, "Future Frisco Net", Communications Week, Mar. 19, 1990 p. 1.
C. Medford, "Howard U. Combines Centrex, PBX To Integrate Network", MIS Week, May 21, 1990, p. 16.
Cooney Thomas M.
English Kenneth E.
Turner James L.
Welsh Robert M.
Whildin Kathleen C.
AT&T Corp.
Dwyer James L.
Hong Harry S.
Ulrich Werner
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