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  2. List of SIP software - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_software

    Interactive Intelligence Windows-based IP PBX for small, medium and enterprise organizations; Kerio Operator, IP PBX for small and medium enterprises; Microsoft Lync Server 2010 & 2013; Mitel Communications Director; NEC SV7000 back-to-back user agent SIP PBX; NEC UNIVERGE 3C Unified Communications and Collaboration software; Nokia Siemens ...

  3. 3CX - Wikipedia

    en.wikipedia.org/wiki/3CX

    3CX, Inc., is a software development company and developer of the 3CX Phone System. The 3CX Phone System is a software private branch exchange based on the SIP (Session Initiation Protocol) standard to allow calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services.

  4. Grandstream Networks - Wikipedia

    en.wikipedia.org/wiki/Grandstream_Networks

    Founded in 2002, Grandstream Networks is a manufacturer of IP voice and video communications equipment, video surveillance, [1] gateways and analog telephone adapters (ATAs), and Asterisk-based IP-PBX appliances. Grandstream supplies small and medium businesses and consumers with open-standard SIP-based products.

  5. Elastix - Wikipedia

    en.wikipedia.org/wiki/Elastix

    Elastix 5.0 is an IP business phone system that supports standard SIP soft/hard phones, VoIP services and traditional PSTN phone lines. Elastix 2.5 is free software, released under the GNU General Public License. Elastix 5.0 is Proprietary released under the terms of the 3CX license.

  6. IP PBX - Wikipedia

    en.wikipedia.org/wiki/IP_PBX

    An IP PBX ("Internet Protocol private branch exchange") is a system that connects telephone extensions to the public switched telephone network (PSTN) and provides internal communication for a business. An IP PBX is a PBX system with IP connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP ...

  7. 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 used ...

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