M21
Telefonisüsteem
Telephone system
L1
CodeM21DomainCF/R Funktsionaalne süsteemParent—Standard—Sub-cats—Inbound—
DEFINITSIOON · ET
isiklik sidesüsteem kahesuunaliseks suhtluseks
DEFINITION · EN
personal communication system for two-way communication
Examplesemergency telephone system, conference system, emergency telephone system, intercom system, intercom system, telephone system, telecommunication system
last_edited: 17.05.2026, 12:46