NAT CG Ltd United States
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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.
Ematel Communications
Ematel Communications has a long and proud history as a wholesale voice provider. We've been enabling other carriers and service providers for years.
Ematel let's you drive with our fully automated online customer access portal, enables you
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