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2. Unified communications - Wikipedia

   en.wikipedia.org/wiki/Unified_communications

   These systems used the phone company's analog or digital circuits to deliver phone calls from a central office (CO) to the customer. The system —PBX or key telephone system— accepted the call and routed the call to the appropriate extension or line appearance on the phones at the customer's office. In the 1980s, voice mail systems with IVR ...

3. Voicemail - Wikipedia

   en.wikipedia.org/wiki/Voicemail

   Voicemail. A voicemail system (also known as voice message or voice bank) is a computer-based system that allows people to leave a recorded message when the recipient is unable to answer the phone. The caller is prompted to leave a message and the recipient can retrieve said message at a later time. Voicemail can be used for personal calls and ...

4. Plain old telephone service - Wikipedia

   en.wikipedia.org/wiki/Plain_old_telephone_service

   Plain old telephone service. Plain Old Telephone Service ( POTS ), or Plain Ordinary Telephone System, [ 1] is a retronym for voice-grade telephone service employing analog signal transmission over copper loops. Originally POTS stood for Post Office Telephone Service as early phone lines in most parts of the world were operated directly by the ...

5. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system ( KTS) to the private branch exchange ( PBX ). A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines ...

6. Interactive voice response - Wikipedia

   en.wikipedia.org/wiki/Interactive_voice_response

   Interactive voice response ( IVR) is a technology that allows telephone users to interact with a computer-operated telephone system through the use of voice and DTMF tones input with a keypad. In telephony, IVR allows customers to interact with a company's host system via a telephone keypad or by speech recognition, after which services can be ...

7. Nortel Norstar - Wikipedia

   en.wikipedia.org/wiki/Nortel_Norstar

   Nortel Norstar. The Nortel Norstar, previously the Meridian Norstar, was a small and medium-sized business digital key telephone system introduced by Nortel (formerly Northern Telecom) and later sold to Avaya. It featured automatic call distribution, and supported up to 192 extensions. In the United Kingdom it was sold by British Telecom ...

8. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   3CX Phone System, for Windows, Debian 8 GNU/Linux. Aastra 5000, 800, MX-ONE. Alcatel-Lucent 5060 IP Call server. Aricent SIP UA stack, B2BUA, proxy, VoLTE/RCS Client. AskoziaPBX. Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP. Bicom Systems IP PBX for telecoms. Brekeke PBX, SIP PBX for service providers and enterprises.

9. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Website. voice .google .com. Google Voice is a telephone service that provides a U.S. phone number to Google Account customers [ 1] in the U.S. and Google Workspace (G Suite by October 2020 [ 2]) customers in Canada, Denmark, France, the Netherlands, Portugal, Spain, Sweden, Switzerland, the United Kingdom and the contiguous United States. [ 3]