A network -provided service feature , associated with the switching center equipment, in which services, such as directory assistance, call interception, random conferencing, and precedence calling assistance, are rendered by an attendant. ( 188 )
DIAL SERVICE ASSISTANCE (DSA)
Meaning of DIAL SERVICE ASSISTANCE (DSA) in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012