Question: In Lawful Interception (LI) access verification for Handover Interface (HI), what is the primary purpose of using the supplementary service COLP, and how does its check accommodate variability in numbering?
Option 1: To verify the caller's identity at the LEMF, strictly matching a single expected number.
Option 2: To ensure only the intended terminal on the LEA's side accepts calls, allowing for two correct numbers (user-provided and network-provided) due to potential DDI extensions.
Option 3: To disable CLIP checks at the Handover Interface for enhanced security, using a single predefined number for validation.
Option 4: To bypass LI access verification entirely for calls originating from specific networks, based on their connected line identification.
Explanation: The correct answer is Option 2 because COLP (Connected-Line identification Presentation) verifies that the incoming call at the Handover Interface (HI) is accepted only by the intended terminal on the Law Enforcement Agency's (LEA's) side, allowing for flexibility by accepting two different numbers as valid: user-provided (with potential DDI extension) and network-provided, accommodating variations in number presentation across networks.