Thirdlane Business PBX - Description: Thirdlane PBX - VoIP Phone System and Unified Communications Solution for Small Business to Enterprise. Phone ☎ +1 415 / 261-6600
Asterisk - An open source telephony switching and private branch exchange service for Linux.
Brosix - Brosix will improve the efficiency and decrease the expenses of your business by providing you all-in-one features package and many control functions.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
3CX - Hosted PBX with CRM integration and mobile apps
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.