To authorize a user for IMS services, we need to provision the user on which services?

Interview
1

Q. To authorize a user for IMS services, we need to provision the user on which services?

a) IMS APN
b) All other choices
c) HSS profile for IMS
d) AS Profile for IMS

Check 🔎

:arrow_right: Correct answer: Letter b.

Provisioning a user for IMS services requires configurations across multiple components, not just one. The user must be provisioned in the HSS (for IMS subscription and iFCs), assigned the IMS APN (for bearer setup), and optionally provisioned in the Application Server (AS) for services like Voicemail or SMS over IMS.

Q. To authorize a user for IMS services, we need to provision the user on which services?

a) :x: IMS APN
→ Incorrect. While the IMS APN is essential for data connectivity to the IMS domain, it is not sufficient alone for IMS authorization.

b) :white_check_mark: All other choices
→ Correct. IMS service authorization depends on:

  • IMS APN → for establishing default bearer
  • HSS Profile → for user identity, authentication, and iFC rules
  • AS Profile → for value-added services linked to that user

c) :x: HSS profile for IMS
→ Incorrect. The HSS provides subscriber data and authentication but needs to work in conjunction with the other layers.

d) :x: AS Profile for IMS
→ Incorrect. The AS profile supports services like Voicemail/SMS but cannot authorize a user on its own.