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  2. H.323 - Wikipedia

    en.wikipedia.org/wiki/H.323

    H.323 is a system specification that describes the use of several ITU-T and IETF protocols. The protocols that comprise the core of almost any H.323 system are: [8] H.225.0 Registration, Admission and Status (RAS), which is used between an H.323 endpoint and a Gatekeeper to provide address resolution and admission control services.

  3. 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 ...

  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. 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.

  6. 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 ...

  7. Visual voicemail - Wikipedia

    en.wikipedia.org/wiki/Visual_voicemail

    Visual voicemail is direct-access voicemail with a visual interface. Such an interface presents a list of messages for playback, as opposed to the sequential listening required using traditional voicemail, and may include a transcript of each message. In 2007, Apple's iPhone was the first cell phone promoting this feature.

  8. 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

  9. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. [1] SIP is used in Internet telephony, in private IP telephone systems, as well as mobile phone calling over LTE . [2]