YEALINK
Yealink is a global leading unified communication (UC) solution provider that primarily offers video conferencing systems and voice communication solutions.

SANGOMA
Sangoma Technologies Corporation is a trusted leader in delivering globally scalable Voice-Over-IP telephony systems, both on-site and cloud-based.

GRANDSTREAM
Grandstream Networks, Inc. has been connecting the world since 2002 with SIP Unified Communications solutions that allow businesses to be more productive than ever before. Grandstream solutions lower communication costs, increase security protection and enhance productivity.

POLYCOM
Polycom is the premier provider of communications and collaboration technology. providing solutions spans headsets, desk phones, audio and video conferencing, software, analytics and services that work with any platform.

ASTERISK
Asterisk is a free and open source framework for building communications applications and is sponsored by Digium. Asterisk powers IP PBX systems, VoIP gateways, conference servers, and is used by SMBs, enterprises, call centers, carriers and governments worldwide.

DIGIUM
Digium has become a leader in the telephony market, feature-rich Unified Communications (UC) solutions that are affordable to organizations of all sizes. Featured products include the Asterisk open source project, Switchvox UC solutions, IP phones, and SIP Trunking services.

ELASTIX
Elastix is an 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.

FREEPBX
FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. FreePBX can be installed manually or as part of the pre-configured FreePBX Distro that includes the system OS, Asterisk, FreePBX GUI and assorted dependencies.