The Norwegian Telecom Administration (Televerket, later Telenor AS from 1994) introduced the "Tastafon" as the new standard telephone in the early 1980s, replacing the ubiquitous 1967 pulse-dial model. The Tastafon was the first Norwegian telephone to feature a push-button keypad and support dual-tone multi-frequency (DTMF) signaling, coinciding with the introduction of computerized telephone exchanges. The handset was manufactured by Elektrisk Bureau, which won the design competition and began development in 1975.¹

I recently purchased one of these at a flea market; it is the analog telephone I remember most fondly from my childhood. When paired with an XLink BT2, the Tastafon can still be used today as a Bluetooth receiver connected to a modern smartphone. Below is a scan of the schematic that was originally tucked away beneath the keypad on these handsets.