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.
Acestar Telecommunication Systems HKG Ltd.
Acestar Telecommunication Systems HKG Ltd. (ACESTAR), formerly Starton Technology Ltd., is a private limited liability company incorporated under the laws of Hong Kong and is wholly managed and operated by its Philippine-based affiliate, Acetel Management
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