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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.
Elisha Telecom
Elisha Telecom Fully Managed PBX makes use of Voice Over Internet Protocol (VoIP) to provide Full PBX functionalities to Small and Medium Business without the capital expense of purchasing and the need for technical knowhow in managing your PBX System.
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