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  2. 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]

  3. Do Not Disturb (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Do_Not_Disturb...

    The Do Not Disturb or (DND) function on most PBX or PABX systems prevents calls from ringing on an extension for which DND is activated. Some Do Not Disturb (DND) attributes include directing the call to a preassigned extension (like a secretary or assistant), busy signal, DND signal, or recorded message generated by the telephone switch.

  4. Unify (company) - Wikipedia

    en.wikipedia.org/wiki/Unify_(company)

    Unify is a Mitel company [1] headquartered in Munich, Germany and is present in over 100 countries. [2] It provides software-based enterprise unified communications including voice, Web collaboration, video conferencing and contact center, networking product and services.

  5. List of SIP software - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_software

    This list of SIP software documents notable software applications which use Session Initiation Protocol (SIP) as a voice over IP (VoIP) protocol. Servers [ edit ]

  6. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    List of the mainly electro mechanical switching systems from Hasler AG Bern, which were used in public telephone network in Switzerland for many decades. Hasler AG finally merged into Ascom in 1987. HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and ...

  7. List of symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_symbols

    Many (but not all) graphemes that are part of a writing system that encodes a full spoken language are included in the Unicode standard, which also includes graphical symbols. See: Language code; List of Unicode characters; List of writing systems; Punctuation; List of typographical symbols and punctuation marks

  8. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    The server did not receive a valid Referred-By token on the request. [15] 430 Flow Failed A specific flow to a user agent has failed, although other flows may succeed. This response is intended for use between proxy devices, and should not be seen by an endpoint (and if it is seen by one, should be treated as a 400 Bad Request response).

  9. Miscellaneous Symbols and Pictographs - Wikipedia

    en.wikipedia.org/wiki/Miscellaneous_Symbols_and...

    Miscellaneous Symbols and Pictographs is a Unicode block containing meteorological and astronomical symbols, emoji characters [3] largely for compatibility with Japanese telephone carriers' implementations of Shift JIS, and characters originally from the Wingdings and Webdings fonts found in Microsoft Windows.