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2. FreePBX - Wikipedia

   en.wikipedia.org/wiki/FreePBX

   FreePBX is a web-based open-source graphical user interface (GUI) that manages Asterisk, a voice over IP (VoIP) and telephony server. [2]FreePBX is licensed under the GNU General Public License version 3, [3] with commercial modules available under their own licenses.

3. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   Virtual PBX systems or hosted PBX systems deliver PBX functionality as a service, available over the public switched telephone network (PSTN) or the Internet. Hosted PBXs are typically provided by a telephone company or service provider, using equipment located in the premises of a telephone exchange or the provider's data center. [ 13 ]

4. FreePBX Distro - Wikipedia

   en.wikipedia.org/wiki/FreePBX_Distro

   The FreePBX Distro was released in 2011 as an turnkey solution for building a PBX using Asterisk, CentOS and FreePBX. [9] [10] [11] FreePBX has over 1 million active production PBXs and over 20,000 new systems added each month. [12] The core telephony engine is Asterisk (PBX), as configured by the Open Source FreePBX GUI. [13]

5. VirtualPBX - Wikipedia

   en.wikipedia.org/wiki/VirtualPBX

   The company was founded in San Francisco in 1997 by voice-based application developer Stephen Lange—now its chief technology officer—whom the company credits with coining the term virtual PBX. [1]

6. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   3Com VCX IP telephony module: back-to-back user agent SIP PBX; 3CX Phone System, for Windows, Debian 8 GNU/Linux; Aastra 5000, 800, MX-ONE; Alcatel-Lucent 5060 IP Call server; Aricent SIP UA stack, B2BUA, proxy, VoLTE/RCS Client; AskoziaPBX; Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP; Bicom Systems IP PBX for telecoms

7. Telephone number mapping - Wikipedia

   en.wikipedia.org/wiki/Telephone_number_mapping

   The user agent of an ENUM-enabled subscriber terminal device, or a PBX, or a gateway, translates the request for the number +34 98 765 4321 in accordance with the rule described in RFC 6116 into the ENUM domain 1.2.3.4.5.6.7.8.9.4.3.e164.arpa. A request is sent to the DNS for the NAPTR record of the domain name 1.2.3.4.5.6.7.8.9.4.3.e164.arpa.