What protocol does 3CX primarily use for VoIP communication?

3CX primarily uses the Session Initiation Protocol (SIP) for VoIP communication. SIP serves as a signaling protocol, establishing, modifying, and terminating multimedia sessions such as voice and video calls over the internet. One of the reasons SIP is favored in 3CX is its flexibility and interoperability with numerous VoIP systems, making it a widely adopted standard in the telecommunications industry. This capability allows 3CX to integrate seamlessly with various devices and services, helping to facilitate effective communication across diverse networks.

Additionally, SIP's ability to handle multimedia sessions efficiently, combined with its support for features like user registration, call management, and presence information, makes it a robust choice for VoIP applications within the 3CX environment. This positions 3CX as a scalable solution suitable for both small and large businesses, enhancing its reputation and functionality in delivering VoIP communication services.