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.
ComfyTel Networks
Comfytel is a mobile communications operator that provides VoIP/internet telephony service around the world. The Comfytel VoIP applications (WingBee Pro and Altphone) available for the most available mobile platforms and allows people to make telephone c
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