Q. Initial Filter Criteria are stored in?
a) IBCF
b) PCRF
c) UE SIM
d) HSS user profile
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Correct answer: Letter d.
The Initial Filter Criteria (iFC) are stored in the HSS user profile.
- iFCs define how the S-CSCF should route SIP messages and trigger application servers (AS) during IMS registration or session setup.
- The HSS sends the iFCs to the S-CSCF during user registration via the Multimedia-Auth-Answer (MAA) or Server Assignment Answer (SAA).
- They are not stored in the PCRF, which handles policy control—not SIP routing logic.
Q. Initial Filter Criteria are stored in?
a) IBCF
→ Incorrect. The Interconnection Border Control Function handles SIP messages at network borders, not iFC storage.
b) PCRF
→ Incorrect. PCRF manages policy and charging rules, not SIP service logic or iFC.
c) UE SIM
→ Incorrect. While the SIM contains IMS credentials, iFCs are stored in the network-side HSS.
d) HSS user profile
→ Correct. iFCs reside in the user profile on the HSS, and guide the S-CSCF during call/session handling. iFC XML resides in HSS and is downloaded to S-CSCF.
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