Question: What is the primary purpose of NASS-IMS-bundled authentication in telecom networks, particularly in relation to legacy equipment?
Option 1: To enable nomadicity and roaming for users across different access networks while maintaining IMS security.
Option 2: To provide a secondary layer of security for IMS applications on top of existing NASS authentication for enhanced protection.
Option 3: To facilitate access to the IMS network for legacy equipment that cannot support standard IMS access security protocols.
Option 4: To simplify the authentication process for users by eliminating the need for separate NASS and IMS logins.
Explanation: NASS-IMS-bundled authentication is primarily used to enable legacy equipment, which lacks support for standard IMS (IP Multimedia Subsystem) access security protocols, to access the IMS network. This method leverages the existing Network Access and Security Services (NASS) authentication to grant access, thereby ensuring these devices can still utilize IMS services without requiring updates to support IMS-specific security measures.