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Intercom was a small telephone network, which allowed calling strictly within the office. That was the Jurassic era of telecommunication when the dinosaurs state-owned incumbents mercilessly harassed the consumers. At that time the ‘sophisticated’ office automation equipment called intercom was a ‘must have’ gadget across the public and private enterprises. Speakerphone or hands-free calling feature was intercom’s jewel in the crown. Unlike the rotary-dial PSTN phones, the “trendy” intercom sets were fitted with a push-button keypad.