Q. Interface used in IMS Online Charging between AS and OCS
a) Rf
b) Rx
c) Gx
d) Ro
Check 🔎
Correct answer: Letter d.
The Ro interface is used in IMS for Online Charging between the Application Server (AS) and the Online Charging System (OCS) to handle real-time credit control.
Q. Interface used in IMS Online Charging between AS and OCS
a) 
“Rf”
→ Incorrect. Rf is used for offline charging between CDF and CGF.
b) “Rx”
→ Incorrect. Rx connects PCRF to P-CSCF for policy and charging control.
c) “Gx”
→ Incorrect. Gx links PCRF and PGW for policy enforcement.
d) 
“Ro”
→ Correct. Ro handles online charging between AS and OCS.
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