A butt-set is used to test the telephone line at selective points such as the telco NID box or where the line connects to the phone or payphone. The butt-set can also be used to monitor a phones activity on the line such as dial outpulsing.
Integrated circuit design
Tone (DTMF) or pulse (Rotary)
Line powered for talk, monitor or dialing function
Built-in ringer
Built-in polarity guard
Last number redial
Mute button. This button operates only as long as user keeps it depressed
Includes polarity test. LED lights up green when polarity is correct
Talk/Mon (monitor) switch (MON position allows line monitoring without disruption)
It certainly doesn't have a Touch Tone keypad at all, it is a loop-disconnect decadic dialler, which would be more suitably updated if it had been done with a Touch Tone keypad with full MF dialing. As it stands the keypad makes it about as useful as the original :)
Aesthetically good without the plinth
Sadly just an ornament without the proper MF keypad, a surprising oversight that makes the Paramount version more attractive
