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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. VoIP phone - Wikipedia

   en.wikipedia.org/wiki/VoIP_phone

   STUN is used in some of the sip phones to enable the SIP/RTP packets to cross boundaries of two different IP networks. A packet becomes unroutable between two sip elements if one of the networks uses private IP address range and other is in public IP address range. Stun is a mechanism to enable this border traversal.

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. Avaya IP Phone 1140E - Wikipedia

   en.wikipedia.org/wiki/Avaya_IP_Phone_1140E

   Avaya IP Phone 1140E in telecommunications is a desktop Internet Protocol client from 1100-series manufactured by Avaya for unified communications. The phone can operate on the Session Initiation Protocol (SIP) or UNIStim protocols. [1] The SIP firmware supports presence selection and notification along with secure instant messaging.

6. 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 ...

7. Lingo (VoIP Service operator) - Wikipedia

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

   In December 2018, Lingo finalized the acquisition of Impact Telecom, LLC "Impact" based out of Irving, TX. The Impact acquisition included its customers, operations, and network infrastructure. The merger of Lingo and Impact creates a leading global telecom and managed service provider, with approximately 250,000 SMB, Carrier, and Consumer ...