Does the 3CX SBC tunnel all SIP and RTP traffic over a single port?

The correct answer is that the 3CX SBC (Session Border Controller) does indeed tunnel all SIP and RTP traffic over a single port. This functionality is essential in simplifying network configurations and improving the connection process between remote extensions and the 3CX phone system. By routing both SIP signaling and RTP media stream through the same port, the SBC ensures a consolidated firewall traversal, which can significantly reduce the complexity of network settings and potential issues related to NAT (Network Address Translation) traversal.

This design choice is particularly beneficial for VoIP (Voice over Internet Protocol) environments, as it minimizes the number of ports that need to be opened and monitored on firewalls, thus enhancing security and ensuring that media streams are handled efficiently without the risk of packet loss that could occur if they were separated.

In situations where multiple ports are used for SIP and RTP separately, managing firewall rules can become cumbersome and lead to errors or connectivity issues. By using a single port for both types of traffic, the 3CX SBC promotes a streamlined communication method that is reliable and user-friendly.