Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Utility Patent
1995-12-19
2001-01-02
Hong, Harry S. (Department: 2742)
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
C379S201060, C379S230000, C379S901000
Utility Patent
active
06169797
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to a method for setting up telecommunication connections in a telecommunication private branch exchange.
Telephone private branch exchanges are known that have remotely located terminals, what are referred to as external extensions. The external extensions are electrically connected to the appertaining private branch exchange via dedicated, physical current paths. Such a structure has the disadvantage, first, that connecting cables must be laid between private branch exchange and external extension or that corresponding trunk lines must be leased from another network operator, for example a public network operator. The connecting cables or lines are to be provided over long distances depending on the local conditions. Transmission-oriented problems such as, for example, attenuation result from transmission of useful information over greater distances. Appropriate measures must be undertaken to eliminate the problems or to keep them within tolerable limits. A further fundamental problem is that the trunk lines cannot be laid over the theoretically shortest path in every case. For example, external extensions cannot be directly connected to the private branch exchange when a street or someone else's property lies between the external extension and the private branch exchange.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved method for setting up telecommunication connections in a telecommunication private branch exchange (PBX).
In general terms the present invention is a method for setting up telecommunication connections in a telecommunication private branch exchange with a controller having a program. Within the framework of a call setup, signalling information, that comprise information indicating the telephone number of the destination user terminal equipment, is checked to determine if respective main station telephone number information is internally present in the system for this telephone number information. The controller initiates the dialing of this main station telephone number insofar as main station telephone number information is internally present in the system for the telephone number of the destination user terminal equipment.
In an advantageous development of the present invention the program allocated to the controller is fashioned such that, within the framework of a call setup, signalling information that comprise information indicating the telephone number of the originating user terminal equipment is checked to determine if respective main station telephone number information is internally present in the system for this telephone number information. The controller, insofar as a main station telephone number information is internally present in the system for the telephone number of the originating user terminal equipment and, insofar as a main station telephone number information is likewise internally present in the system for the telephone number of the destination user terminal equipment or the destination user terminal equipment is an internal user terminal equipment of the telecommunication private branch exchange, activates a system-specific protocol after the set up of the telecommunication connection and enables the transmission of the useful information within the framework of this protocol.
All information required for a switching-oriented linking of external extension to the private branch exchange can thereby be exchanged between extension and private branch exchange in a transparent way via a telecommunication network, particularly the public ISDN. According to the advantageous embodiment of the present invention, the external extensions (terminals) are offered the same scope of performance features as the internal extensions of the private branch exchange.
As a result, the laying of connecting cables is superfluous. Further, the transmission-oriented problems that can particularly occur given trunks of a greater length are avoided.
REFERENCES:
patent: 4955047 (1990-09-01), Morganstein et al.
patent: 5099511 (1992-03-01), Matsumoto
patent: 5291551 (1994-03-01), Conn et al.
patent: 5459780 (1995-10-01), Sand
patent: 5528678 (1996-06-01), Kaplan
patent: 5530744 (1996-06-01), Charalambous et al.
Voelzke Eckhard
Wildgrube Eberhard
Hong Harry S.
Schiff & Hardin & Waite
Siemens Aktiengesellschaft
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