DR. DAVID MARCUS LIEBERMAN, M.D.
Medical Practice at Welch Rd, Palo Alto, CA
License number
California A101911
Category
Medical Practice
Type
Otolaryngology
Address
Address
801 Welch Rd, Palo Alto, CA 94305
Phone
(650) 725-6500
Professional information
Distributed Cbx System Employing Packet Network
US Patent:
4313036, Jan 26, 1982
Filed:
Feb 19, 1980
Appl. No.:
6/122415
Inventors:
Michael D. Jabara - San Francisco CA
Charles H. Jolissaint - Sunnyvale CA
David Lieberman - Palo Alto CA
John D. Edwards - Campbell CA
Charles H. Jolissaint - Sunnyvale CA
David Lieberman - Palo Alto CA
John D. Edwards - Campbell CA
Assignee:
Rolm Corporation - Santa Clara CA
International Classification:
H04M 706
US Classification:
179 18AD
Abstract:
A distributed CBX system which provides a virtual network between remotely located CBXs is disclosed. The CBXs are connected to both a voice network and a packet network. A first CBX may interrogate a second CBX to determine, by way of example, the status of a called station at the second CBX over the packet network. The second CBX not only provides the status of the called station but also provides, if the called station is clear, the number of a free incoming line at the second CBX. In this manner, the first CBX can place a call to both an available line and station at the second CBX. Alternatively, because of facility availability or tariff structures, the call may be originated over common carrier facilities in the reverse direction originating over common carrier facilities from the called party end.