In a party line , ringing only the desired user instrument. ( 188 ) Note: Without selective ringing, all the instruments on the party line will ring at the same time , selection being made by the number of rings.
SELECTIVE RINGING
Meaning of SELECTIVE RINGING in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012