3CX Phone System is an open-source, software-based private branch exchange (PBX) system. It provides businesses with a secure, reliable, and cost-effective VoIP communication solution. It is based on the SIP standard, making it compatible with most common IP phones, SIP gateways, VoIP services, and softphones. Features include call forwarding, call recording, call routing, and voice mail. 3CX Phone System also integrates with popular CRM applications, such as Salesforce, to provide a unified communications experience. It also offers a range of mobile apps that allow users to make and receive calls, manage contacts, and set up conference calls on their mobile devices. 3CX Phone System is an easy-to-use, reliable, and secure solution for small, medium, and large businesses.
YakYak is a client for Google Hangouts, while 3CX is a VoIP call center system.