Installation and Support Services
These are the services that include specific software or hardware installation for a certain company with further technical support needed for the system to operate correctly.
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.
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