The next major product was a large digital PBX called the SX2000.
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Ltd . are 100 % private Canadian and Australian Digital phone companies offering home phone services, SOHO, medium & large digital PBX services.
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Sometimes a method is supplied with a digital PBX that can process the proprietary signal ( usually a conversion box ) before being channeled to a computer for recording.
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It quickly outsold AT & T, who at the time had not come out with a digital PBX, and became # 2 behind the Nortel SL-1 switch by 1980.
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"' Meridian Mail "'was one of the early all-digital voicemail systems, running on Meridian Norstar digital PBX systems from Northern Telecom ( later known as Nortel ).
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ROLM's digital PBX ( called a CBX, for Computerized Branch eXchange ) was the first to enable PhoneMail to illuminate a message waiting light on ROLM phones equipped with message waiting lights ( also a stutter dialtone is used with analog and digital phones ).
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In your case it's likely that your office has a digital PBX system ( which are either IP or a proprietary protocol ) and a regular ethernet; the telephones connected to the PBX need power as well as signal ( and at a nontrivial voltage, as they're now fairly sophisticated computer devices with screens and stuff ).
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