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  2. 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.

  3. 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]

  4. 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 ...

  5. National Do Not Call Registry - Wikipedia

    en.wikipedia.org/wiki/National_Do_Not_Call_Registry

    The law established the FTC's National Do Not Call Registry in order to facilitate compliance with the Telephone Consumer Protection Act of 1991. [2] A guide by FTC addresses a number of cases. [3] Registration for the Do-Not-Call list began on June 27, 2003, and enforcement started on October 1, 2003.

  6. National Do Not Call List - Wikipedia

    en.wikipedia.org/wiki/National_Do_Not_Call_List

    The National Do Not Call List (DNCL) (French: Liste nationale de numéros de télécommunication exclus) is a list administered by the Canadian Radio-television and Telecommunications Commission (CRTC) that enables residents of Canada to decide whether or not to receive telemarketing calls. [1]

  7. 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).

  8. Do not call list - Wikipedia

    en.wikipedia.org/wiki/Do_not_call_list

    A do not call list or do not call registry is a list of personal phone numbers that are off-limits to telemarketers in some countries. Do not call lists may also be held privately by a company, listing numbers that they will not call.

  9. Do Not Disturb Registry - Wikipedia

    en.wikipedia.org/wiki/Do_Not_Disturb_Registry

    In practice, various service providers refer to it as the Do Not Disturb (DND) registry. Telemarketers , after registration from TRAI, receive permission to access the NCPR. The customer preference portal [ 1 ] on TRAI website details the official rules regarding registry setup and the procedure for registering on the 'do not disturb' registry.