Question: What action does HLR B take when BIC-Roam (Barring of incoming calls when roaming outside the home PLMN country) is activated for a destination, affecting a queued CCBS (Completion of Calls to Busy Subscriber) Request?
Option 1: HLR B sends 'Start Reporting' to MSC B and activates the affected CCBS Request.
Option 2: HLR B cancels the associated CCBS Request related to the Basic Service Group and processes the next non-suspended request in the queue for other groups.
Option 3: HLR B puts all CCBS Requests in the destination's queue into a 'Suspended' state without notifying MSC B.
Option 4: HLR B accepts the activation attempt but indicates long-term denial in the response to the CCBS Request.
Explanation: When BIC-Roam is activated, affecting a queued CCBS Request, HLR B must manage the queue accordingly. Since the activation of BIC-Roam for a particular Basic Service Group would prevent a CCBS call from being permitted, HLR B logically cancels the associated request to comply with the barring condition and then selects the next viable (non-suspended) request in the queue for processing, ensuring continuity of service for other unaffected groups.