SIP uses which ports for standard and secure communication?

SIP uses which ports for standard and secure communication?

• A. Port 5060 for standard communication and 5061 for secure communication
• B. Port 80 for standard and 443 for secure communication
• C. Port 25 for standard and 465 for secure communication
• D. Port 53 for standard and 123 for secure communication

Answer: (A)

SIP signaling relies on specific default ports: 5060 for standard, non‑encrypted communication and 5061 for secure (TLS‑encrypted) communication. These ports are the usual entry points for SIP messages that set up, modify, and tear down sessions. SIP can run over UDP or TCP on 5060, while 5061 is used when the signaling is encrypted with TLS (SIPS). The media stream itself (the actual voice or video) typically travels over separate RTP ports negotiated during session setup, not the SIP signaling ports. Other port pairs listed correspond to entirely different services: 80/443 are web (HTTP/HTTPS) ports, 25/465 are email (SMTP) ports, and 53/123 relate to DNS and NTP respectively. They aren’t the standard ports used for SIP signaling.

SIP signaling relies on specific default ports: 5060 for standard, non‑encrypted communication and 5061 for secure (TLS‑encrypted) communication. These ports are the usual entry points for SIP messages that set up, modify, and tear down sessions. SIP can run over UDP or TCP on 5060, while 5061 is used when the signaling is encrypted with TLS (SIPS). The media stream itself (the actual voice or video) typically travels over separate RTP ports negotiated during session setup, not the SIP signaling ports.

Other port pairs listed correspond to entirely different services: 80/443 are web (HTTP/HTTPS) ports, 25/465 are email (SMTP) ports, and 53/123 relate to DNS and NTP respectively. They aren’t the standard ports used for SIP signaling.