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.
Wholesale A-Z Voip Termination
GemahVoip is a carrier providing all your VoIP needs. We offer Business VoIP Services • Wholesale A-Z VoIP Termination. GemahVoip also offers stable, low cost and affordable VoIP Rates for all the services offered.