Initial Filter Criteria are stored in?

Interview
1

Q. Initial Filter Criteria are stored in?

a) IBCF
b) PCRF
c) UE SIM
d) HSS user profile

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:arrow_right: 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) :x: IBCF
→ Incorrect. The Interconnection Border Control Function handles SIP messages at network borders, not iFC storage.

b) :x: PCRF
→ Incorrect. PCRF manages policy and charging rules, not SIP service logic or iFC.

c) :x: UE SIM
→ Incorrect. While the SIM contains IMS credentials, iFCs are stored in the network-side HSS.

d) :white_check_mark: 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.