A SIP port is a network port used by SIP-based communication systems to send and receive SIP messages over the IP network. A SIP port is a logical connection endpoint that identifies a specific process or service running on a computer or device. The default port for SIP traffic is 5060 for both UDP and TCP. However, SIP traffic can also be transmitted over 5061 (TCP or TLS), 5062, and 5063 ports. In addition, SCTP, WebSocket, and WebRTC transport protocols can also be used. SIP-based communication systems, such as IP phones, softphones, and SIP servers, use the SIP port to establish and manage sessions for voice and video calls, instant messaging, and other types of real-time communications.