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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.
Shannon Trade LLC
Shannon Telecom is a telecommunication company rendering International long distance services to local and foreign companies and their employees operating in CIS countries. Our objective is to provide our corporate customers with cheap long distance servi
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