Compass International Co., Ltd China
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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.
Telphin
Telphin is an Internet (VoIP) Phone Service Provider. We provide high quality and low price telecommunications for local, long-distance, and international calling! Telphin offers unlimited calling plans for an inexpensive monthly payment. All clients conn
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