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2. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Bicom Systems IP PBX for telecoms; Brekeke PBX, SIP PBX for service providers and enterprises; Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified Communication Manager (CUCM) CommuniGate Pro, virtualized PBX for IP Centrex hosting, voicemail services, self-care, ... Comverse Technology softswitch, media applications, SIP ...

3. SipXecs - Wikipedia

   en.wikipedia.org/wiki/SipXecs

   SipXecs is a free software enterprise communications system. [1] It was initially developed by Pingtel Corporation in 2003 as a voice over IP telephony server located in Boston, MA. [2] The server was later extended with additional collaboration capabilities as part of the SIPfoundry project.

4. List of SIP response codes - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_response_codes

   Servers can optionally send this response to indicate a call is being forwarded. [1]: §21.1.3 182 Queued Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available. A server may send multiple 182 responses to update progress of the queue. [1]: §21.1.4 183 Session Progress

5. 3CX - Wikipedia

   en.wikipedia.org/wiki/3CX

   In 2019, 3CX acquired WP Live Chat, a free WordPress plugin for live chat integration. [7] In September 2016, 3CX announced a partnership with BT Wholesale SIP Trunking platform to serve resellers. [8] In 2017 "PBX Express" was released, allowing a hosted PBX to be created on any hosted virtual private server.

6. Elastix - Wikipedia

   en.wikipedia.org/wiki/Elastix

   Elastix is a unified communications server software that brings together IP PBX, email, IM, faxing and collaboration functionality. It has a Web interface and includes capabilities such as a call center software with predictive dialing. The Elastix 2.5 functionality is based on open source projects including Asterisk, FreePBX, HylaFAX, Openfire ...

7. 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]