Question: In a Public Land Mobile Network (PLMN), what is the recommended approach for indicating call progress (e.g., ringing, engaged) to users unfamiliar with specific tones, especially in situations peculiar to mobile networks?
Option 1: Utilize verbal announcements for clarity, reserving tones and other indicators for more common conditions
Option 2: Employ a combination of displayed text and graphical symbols across all scenarios for consistency
Option 3: Default to network-generated tones and music for all call progress indications, regardless of user familiarity
Option 4: Mute all PLMN-generated network tones and announcements for enhanced user experience
Explanation: Verbal announcements are generally reserved for situations unique to mobile networks where users might be unfamiliar with specific tones. This approach enhances clarity for conditions like 'call diversion' or 'subscriber not available', improving the overall user experience, especially for those less familiar with mobile network tone conventions.