1) Telephony equipment 
Dialling, also spelled dialing, is the action of initiating a telephone call by operating the rotary dial or the telephone keypad of a telephone. ==Etymology== The word dial comes from the Latin dialis = `daily`, and comes from the fact that a sundial throws a shadow related to the time of day. It was also used to describe the gear in a medieval.....
• of Dial
the generation, in a network terminal, of signals required for establishing connections automaticallythe generation by a telephone station, of the signals required for establishing connections through an automatic telephone exchange