Which protocol does 3CX utilize for VoIP signaling?

3CX utilizes the Session Initiation Protocol, commonly known as SIP, for VoIP signaling. SIP is a widely adopted signaling protocol used for initiating, maintaining, and terminating real-time communication sessions that involve video, voice, messaging, and other communications across IP networks. By using SIP, 3CX can facilitate the establishment of calls between various devices and ensure that different systems can communicate efficiently.

SIP is preferred due to its simplicity, scalability, and the ability to support a variety of multimedia services, making it an ideal choice for modern communication systems like 3CX. It enables features such as call forwarding, voicemail, and conference calling, which are essential in VoIP environments.

Other protocols, such as H.323, are alternatives to SIP but are not as commonly used in contemporary VoIP systems. Similarly, while Internet Protocol (IP) is crucial for data transmission over networks, it does not specifically handle the signaling required for initiating calls. Real-Time Transport Protocol (RTP) is important for the actual transport of media streams (like voice or video) once a session has been established but does not manage the signaling aspect which is specifically handled by SIP.