Abstract: A telephone switching system and method for switching CENTREX (CTX) calls between CTX subscribers, is provided in which the CTX subscribers comprise mobile subscribers and wired subscribers. A message interface for the transmission of CTX-specific information is established between the mobile switching center allocated to the mobile subscribers and the fixed network switching center allocated to the wired CTX subscribers, and the control of the mobile switching center is supplemented by a control part for the CTX-specific mobile call processing.

Abstract: In accord therewith, at least one identification number (PIID) for identifying a private network (PISN) for access to a first private branch exchange (PBX1) to a subscriber (BS) who was registered and a mobile subscriber telephone number (MSISDN) that was sent into the public mobile radio telephone network (PLMN), is stored in the public mobile radio telephone network (PLMN). A routing number (PRIN) is offered in the mobile radio telephone network on the basis of the incoming mobile subscriber telephone number (MSISDN) and is checked with reference to the stored identification number (PIID) as to whether the call destination lies in the area of a private branch exchange (PBX2) of the same private network (PISN) to which the first private branch exchange (PBX1) belongs.

Abstract: In order to provide immunity against vibrations, a pressure sensor for detecting the prevailing manifold suction pressure in an internal combustion engine, for example, has a movable chamber which responds to the varying pressure and thereby changes the distance between a diffuse reflector and an optical detector assembly. The detector assembly includes a light source, a first light-sensitive detector and a second light-sensitive detector. The second detector is connected to a regulator which so controls the electrical power to the light source that the induced photo current in the second detector remains substantially constant independently of the distance between the reflector and the detectors. A number of embodiments is presented.