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  2. Internet telephony service provider - Wikipedia

    en.wikipedia.org/wiki/Internet_telephony_service...

    An Internet telephony service provider (ITSP) offers digital telecommunications services based on Voice over Internet Protocol (VoIP) that are provisioned via the Internet. ITSPs provide services to end-users directly or as whole-sale suppliers to other ITSPs.

  3. SIP trunking - Wikipedia

    en.wikipedia.org/wiki/SIP_trunking

    SIP trunking is a voice over Internet Protocol (VoIP) technology and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and unified communications facilities. [1]

  4. 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.

  5. List of SIP software - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_software

    Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP) Speedflow Communications VoIP class 4/5 softswitches with integrated billing, transcoding, SIP-H.323 converter. Sterlite Technologies Neox IPPBX, IMS - ISC, Dial Center - OmniChannel Call Center, IVR products

  6. SIP provider - Wikipedia

    en.wikipedia.org/wiki/SIP_provider

    A SIP provider (Session Initiation Protocol) is any telecommunications company which provides SIP trunking to customers, usually businesses. Many companies provide SIP "termination" (outbound calling) and "origination" (inbound calling, usually with a plain old telephone service (POTS) phone number, called a direct inward dialing (DID).

  7. sipgate - Wikipedia

    en.wikipedia.org/wiki/Sipgate

    SIP trunking can be combined with the team product. [citation needed] sipgate basic and sipgate basic plus. The basic residential VoIP service was released in Germany and the UK in January, 2004. [8] basic accounts receive one free UK or German geographic 'landline' phone number and a voicemail box. With a suitable fax-enabled VoIP adapter ...

  8. Session border controller - Wikipedia

    en.wikipedia.org/wiki/Session_border_controller

    A session border controller (SBC) is a network element deployed to protect SIP based voice over Internet Protocol (VoIP) networks. [1]Early deployments of SBCs were focused on the borders between two service provider networks in a peering environment.

  9. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    That RFC also defines a SIP Parameters Internet Assigned Numbers Authority (IANA) registry to allow other RFC to provide more response codes. [1]: §27 [2] This list includes all the SIP response codes defined in IETF RFCs and registered in the SIP Parameters IANA registry as of 27 January 2023. This list also includes SIP response codes ...