Q. What transport is used for RTP in VoLTE?
a) SCTP
b) TCP
c) ICMP
d) UDP
Check 🔎
Correct answer: Letter d.
In a VoLTE call, RTP (Real-time Transport Protocol) carries the actual voice media over the LTE network. Because voice is real-time and cannot tolerate retransmission delays, RTP is transported over UDP, which is a connectionless, low-latency protocol best suited for real-time applications.
Unlike TCP, UDP does not require a handshake or retransmissions, avoiding delays that would degrade voice quality.
Q. What transport is used for RTP in VoLTE?
a) SCTP
→ Incorrect. SCTP is used for signaling transport between MME and eNodeB (S1-MME interface), not for RTP media.
b) TCP
→ Incorrect. TCP is too heavy and retransmission-oriented, making it unsuitable for real-time voice traffic.
c) ICMP
→ Incorrect. ICMP is used for network diagnostic messages (like ping/echo), not media transport.
d) UDP
→ Correct. UDP is the standard transport for RTP media streams in VoLTE because it is lightweight and minimizes latency.
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