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2. 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

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. Selsius Systems - Wikipedia

   en.wikipedia.org/wiki/Selsius_Systems

   Selsius Systems, Inc. was organized in July, 1997 as a wholly owned subsidiary of Intecom, [2] a Dallas-based PBX (Private Branch Exchange) manufacturer, with David C. Tucker as CEO, Richard B. Platt as VP of Engineering and Kevin Brown as VP of Sales and Marketing, as well as numerous other important positions held by the employees of Selsius Systems including John Alexander, Paul Hahn, Dave ...

5. Avaya 1100-series IP phones - Wikipedia

   en.wikipedia.org/wiki/Avaya_1100-series_IP_phones

   The 1120SA is a special-use phone which is certified for use by Sensitive Compartmented Information Facilities (SCIF) users, without an external device. [3] [4]The National Telecommunications Security Working Group (NTSWG) has approved the Avaya IP Phone 1120SA for deployment under the Director of Central Intelligence Directive (DCID 6/9), for VoIP and VoSIP (TSG-6 Type-acceptance CNSS Class-A ...

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. Lingo (VoIP Service operator) - Wikipedia

   en.wikipedia.org/wiki/Lingo_(VoIP_Service_operator)

   Lingo is a global Cloud/UC and managed service provider providing IP-based voice and data, mobile services, and other managed services to the Business, Carrier, and Consumer markets.