APSIS Communications Pte. Ltd Singapore

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APSIS Communications Pte. Ltd
2, Jurong East, 21 Street, 3-183 IMM Bulding
Singapore
Singapore
Singapore

Site: http://www.apsissolutions.com

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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.

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