Mục được đánh dấu với thẻ "256SC Professional Edition":

3CX is an open-standard, software based IP phone system that works with popular IP Phones and SIP trunks whether on premise or in the cloud. A complete Unified Communications solution, including web conferencing, presence, softphones, smartphone clients and more – without the cost and management headaches of an ‘old style’ phone system or the limitations of a shared cloud PBX.