Abstract: An alphanumeric keyboard connects to a telephone line and is operable in two operating modes. The keyboard is in a first operating mode when the telephone is in an “off-hook” condition and no connection on the telephone line has been established. In the first operating mode, the keyboard generates telephone number dialing signals on the telephone line as corresponding alphanumeric keys of the keyboard are pressed. Thus for example as a user enters the letters D-O-G by pressing the corresponding single-letter keys of the keyboard, the signaling tones for the digits 3, 6 and 4 are generated on the telephone line. In an enhanced version, the keyboard assigns distinct signal tones, such as an expanded dual tone multi-frequency (DTMF) set, to each alphanumeric character, thereby significantly increasing the quantity of potential telephone numbers. The keyboard operates in a second operating mode when the telephone is in an off-hook condition and a connection on the telephone line has been established.

Abstract: A method and apparatus for screening an incoming telephone call from a caller on an external telephone line connected to an answering device for recording the call includes inserting into the telephone line a circuit comprising a voltage sensitive device and a bridging device for allowing a handset of a telephone set connected to the telephone line and remote from the answering device to be picked up to listen to the call. The handset of the telephone set is picked up to enable a speaker component of the telephone set without interrupting operation of the answering device. The incoming call is listened to via the enabled speaker component while the answering device operates. A microphone component of the telephone set is optionally enabled to speak with the caller. The operation of the answering device may be interrupted by pressing a switch.