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  2. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    AN/TTC-22 100 Line Automatic/Manual Military Tactical Switch (retired) ... 3300 ICP or Mitel Communications Director (MCD) MiVoice Business ... CS2100 (230,000 ports ...

  3. Mitel Superset - Wikipedia

    en.wikipedia.org/wiki/Mitel_Superset

    The Mitel Superset is a line of telephones made by Mitel. [1] The line began in 1983, with the Superset 4, Mitel's best-selling device to date. [2] Mitel Superset Models

  4. Mitel - Wikipedia

    en.wikipedia.org/wiki/Mitel

    Mitel Networks Corporation is a Canadian telecommunications company. The company previously produced TDM PBX systems and applications, but after a change in ownership in 2001, now focuses almost entirely on Voice-over-IP (VoIP), unified communications, collaboration and contact center products. [2]

  5. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    Phone calls between subscribers of the same provider are usually free when flat-fee service is not available. [12] A VoIP phone is necessary to connect to a VoIP service provider. This can be implemented in several ways: Dedicated VoIP phones connect directly to the IP network using technologies such as wired Ethernet or Wi-Fi. These are ...

  6. VoIP phone - Wikipedia

    en.wikipedia.org/wiki/VoIP_phone

    A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. [1] This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN).

  7. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    A SIP phone is an IP phone that implements client and server functions of a SIP user agent and provides the traditional call functions of a telephone, such as dial, answer, reject, call hold, and call transfer. [16] [17] SIP phones may be implemented as a hardware device or as a softphone.

  8. IP PBX - Wikipedia

    en.wikipedia.org/wiki/IP_PBX

    An IP PBX is a PBX system with IP connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack. Voice over IP (VoIP) gateways can be combined with traditional PBX functionality to allow businesses to use their managed intranet to help reduce long distance expenses and take ...

  9. Voicemail - Wikipedia

    en.wikipedia.org/wiki/Voicemail

    A voicemail system (also known as voice message or voice bank) is a computer-based system that allows callers to leave a recorded message when the recipient has been unable or unwilling to answer the phone.

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