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.
Zeal Telecom Pty Ltd
Zeal Telecom is the fast growing provider of the modern communication services. Zeal Telecom specializes in Voice over IP (VoIP). Its next generation network has presence in Australia and United Kingdom.
Zeal Telecom is utilizing the latest state
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