3CX vs ADTRAN

3CX Phone System is a software based private branch exchange based on the SIP standard. It enables extensions to make calls via the public switched telephone network or via Voice over Internet Protocol services. 3CX Phone System for Windows is an IP business phone system that completely replaces proprietary PBX systems, supports standard SIP soft/hard phones, VoIP services and traditional PSTN phone lines. Its web-based administration makes phone system management easy. 3CX Phone System eliminates the phone wiring network and allows users to easily work remotely.

ADTRAN, Inc. is a provider of telecommunications networking equipment and internetworking products. Its headquarters are in Huntsville, Alabama. The company is ISO 9001 and TL9000 certified. ADTRAN was founded by Mark C. Smith The AT&T divestiture of the Regional Bell Operating Companies, with restrictions that effectively barred their manufacturing of equipment, created an opportunity for companies such as ADTRAN to supply network equipment, both to the seven RBOCs and the new and independent telephone companies in the United States.