Abstract: An interface is described which attaches between the incoming trunk lines from a central office and a PBX system and which monitors the communication between the central office and the PBX to record the signals representative of telephone extension of a called party for later downloading to telephone peripheral equipment attached to the PBX, such as voice mail systems. The interface passively monitors the line during handshake communication between the central office and the PBX and receives the digits of the dialed extension and stores them in memory. The interface then monitors the line for a request to send from the peripheral equipment attached to the PBX. When the request is received, the interface assumes supervision of the telephone line by terminating the line to the central office and the line to the PBX. The interface then downloads the digits of the dialed extension to the telephone peripheral equipment, such as a voice mail system, for identifying the extension to which the message belongs.

Abstract: A universal PBX-to-central office interface for standards conversion is described for supporting normally incompatible telephone equipment in PBX environments. The present invention is adapted for connection between the central office and a PBX along DID and DOD trunk lines. The present invention will capture incoming signaling and data in any one of three dialing modes (DTMF, MF and pulse dial) and convert this standard to whatever dialing mode is required by the equipment attached to the interface. The present invention will also do signaling conversion for peripheral equipment attached to PBX systems such as voice mail systems. The interface is capable of capturing extension signals transmitted from the central office to the PBX and saving them in memory for later downloading to a voice mail system to recover the extension of the dialed party after it has been forwarded to the voice mail system.

Abstract: A hand-held telephone line signaling test instrument is described which provides test and timing measurment for telephone lines employing DID, DOD and POTS trunk lines. The hand-held instrument is capable of sourcing wink-start reverse battery protocol and DTMF, dial pulse or MF dial codes for testing a DID trunk. The device also incorporates a termination impedance and dial code receivers for DTMF, dial pulse and MF dialing codes. Analysis and comparison of the timing and measurements is performed by an internal microprocessor-based system with the results of the measurements displayed on an LCD alphanumeric display.

Abstract: A universal PBX-to-central office interface for standards conversion is described for supporting normally incompatible telephone equipment in PBX environments. The present invention is adapted for connection between the central office and a PBX along DID and DOD trunk lines. The present invention will capture incomping signaling and data in any one of three dialing modes (DTMF, MF and pulse dial) and convert this standard to whatever dialing mode is required by the equipment attached to the interface. The present invention will also do signaling conversion for peripheral equipment attached to PBX systems such as voice mail systems. The interface is capable of capturing extension signals transmitted from the central office to the PBX and saving them in memory for later downloading to a voice mail system to recover the extension of the dialed party after it has been forwarded to the voice mail system.