Q. Default IMS signaling bearer uses which QCI?
a) 5
b) 9
c) 2
d) 1
Check 🔎
Correct answer: Letter a.
The default bearer used for IMS signaling (i.e., SIP messages between UE and P-CSCF) uses QCI 5.
- QCI 5 is standardized in 3GPP for IMS signaling traffic.
- It provides guaranteed bit rate (GBR) with low latency and high priority, ideal for real-time signaling.
- Bearers using QCI 5 are established upon successful IMS registration.
Q. Default IMS signaling bearer uses which QCI?
a) 5
→ Correct. QCI 5 is specifically reserved for IMS signaling traffic. QCI 5 is designated for IMS SIP.
b) 9
→ Incorrect. QCI 9 is for default bearers (non-IMS), typically internet/data traffic.
c) 2
→ Incorrect. QCI 2 is used for conversational video, not signaling.
d) 1
→ Incorrect. QCI 1 is used for IMS voice (VoLTE) media bearer, not signaling.
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