Which ports are generally configured on firewalls for VoIP functionalities in 3CX?

The correct answer is based on the typical configuration used to facilitate VoIP (Voice over Internet Protocol) functionalities in 3CX. When configuring a firewall for VoIP, it is essential to ensure that the appropriate ports for the transmission of real-time audio data are open.

UDP ports in the range of 9000-9500 are commonly used for media transmission in VoIP applications like 3CX. The reason these specific ports are chosen lies in their suitability for transporting voice packets, which require low latency and high throughput. By using these ports, 3CX can effectively manage audio streams, ensuring clear communication without the delays that TCP might introduce.

The use of UDP is particularly important in VoIP because it allows for real-time data transmission without the overhead of connection establishment and error correction found in TCP. This makes it favorable for dynamic and time-sensitive applications such as voice calls, where dropped packets can be tolerated to some extent, but delays cannot.

While other port ranges may serve various purposes in networking or might be used for signaling or other non-essential tasks, the 9000-9500 range directly relates to the requirements for VoIP media and is thus the most fitting choice in this context.