Edwin W Lipien

US Patent:

39782948, Aug 31, 1976

Filed:

Jun 16, 1975

Appl. No.:

5/587060

Inventors:

Albert David Limiero - Longmont CO
Edwin Walter Lipien - Boulder CO

Assignee:

Western Electric Company - New York NY
Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H04M 706

US Classification:

179 27CA

Abstract:

A PBX system is disclosed having a return answer supervisory circuit in a local PBX for automatically detecting and extending an answer indication from a called station located in a distant PBX to an attendant's console in the local PBX on tie trunk calls between the local and distant PBXs. The disclosed system is an improvement in the art in that it does not require major modification to existing equipment for returning the answer indication to the attendant's console.