Method for a private branch exchange with two trunk lines comprising a main telephone set and a plurality of extension telephone sets

摘要

Method in which a free exchange line can be seized from each extension and transferred if required through suffix dialling to another extension on the PBX system. The PBX system is microprocessor- controlled and the object is to find a suitable method for carrying out the aforementioned switching processes, particularly using MF dialling. To achieve this, an MFD receiving circuit is connected to the output of each extension and transfers MFD information in processible form to the microprocessor, which can then control the switching processes as appropriate. The method is suitable for use in small PBX systems. IMAGE