Which port and protocol is used by SIP with TLS for secure signaling?

Which port and protocol is used by SIP with TLS for secure signaling?

• A. 5060 UDP
• B. 5061 TCP
• C. 5060 TCP
• D. 5061 UDP

Answer: (B)

SIP signaling protection is provided by TLS, which encrypts and ensures the integrity of the signaling messages between endpoints. TLS is designed to run over TCP, so SIP that uses TLS travels as SIP over TLS on a TCP connection. The standard port for this secure signaling path is 5061. That’s why the best choice is the one that specifies port 5061 with TCP, since it reflects TLS over TCP protecting the SIP signaling channel. The other options mix in non-secure signaling (such as 5060 on UDP or TCP) or suggest UDP with TLS, which isn’t how TLS-secured SIP is typically implemented.

SIP signaling protection is provided by TLS, which encrypts and ensures the integrity of the signaling messages between endpoints. TLS is designed to run over TCP, so SIP that uses TLS travels as SIP over TLS on a TCP connection. The standard port for this secure signaling path is 5061. That’s why the best choice is the one that specifies port 5061 with TCP, since it reflects TLS over TCP protecting the SIP signaling channel. The other options mix in non-secure signaling (such as 5060 on UDP or TCP) or suggest UDP with TLS, which isn’t how TLS-secured SIP is typically implemented.