SIP can operate over which transport protocols?

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SIP is a signaling protocol used to set up, manage, and tear down multimedia sessions over IP networks, and it relies on transport-layer protocols to move its messages between endpoints. The transport options listed—TCP, UDP, and SCTP—are all legitimate transport-layer protocols that SIP can ride over. UDP offers low overhead and is fast, which is useful for the quick exchanges SIP often performs. TCP provides reliable, ordered delivery, which helps when signaling must be precise and complete. SCTP adds reliability with additional features like multi-streaming and multi-homing, offering another robust option for SIP transport.

The other choices mix in application-layer protocols (HTTP, FTP, SMTP) or network/link-layer protocols (ICMP, ARP, RARP) and short-range wireless technologies (Bluetooth, Zigbee, NFC), which are not transport protocols for SIP. Therefore, the best answer is that SIP can operate over TCP, UDP, or SCTP.