Q. Which Diameter interface connects I-CSCF/S-CSCF and HSS?
a) Gx
b) Cx
c) Rx
d) Sd
Check 🔎
Correct answer: Letter b.
The Cx interface connects the I-CSCF/S-CSCF with the HSS in the IMS architecture using Diameter. It carries messages such as UAR, LIR, MAR, and SAR to manage user registration, authentication, and S-CSCF assignment, supporting key IMS functions like subscriber location and call routing.
Q. Which Diameter interface connects I-CSCF/S-CSCF and HSS?
a) Gx
→ Incorrect. Gx connects the PCRF and P-GW for policy control, not CSCF and HSS.
b) Cx
→ Correct. Cx interface carries Diameter messages between CSCFs and HSS, such as UAR, LIR, MAR, and SAR.
c) Rx
→ Incorrect. Rx is used between P-CSCF and PCRF to exchange session information.
d) Sd
→ Incorrect. Sd is between PCRF and AF (Application Function).
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