Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
Caryn Systems
CARYN SYSTEMS OU was founded in Estonia in 2004 as a division of the telecommunication holding Telix Ltd., innovator in the telecom market since 1991. CARYN SYSTEMS OU provides wholesale A-to-Z VoIP termination with high quality and competitive rates. Hig
Read moreTop countries:
United States 1294
India 440
United Kingdom 425
Canada 348
Bangladesh 338
China 142
Pakistan 134
Australia 133
Spain 123 Russia 114View all countries