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.
Shenzhen RealTone Technologies Inc.,
Real Tone Technologies Co., Ltd is a professional manufacturer of innovative VoIP equipments and unified network communication solutions. We offers a full line of VoIP products including All in one IP PBX phone system, VoIP gateways, E1/T1 PRI trunking
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