Question: During an active call with Call Waiting (CW) service enabled for the called party, what action allows the called party to hold the current call and accept the waiting call within the time-out period?
Option 1: Enter 0 followed by SEND
Option 2: Enter 2 followed by SEND
Option 3: Enter 1 followed by SEND
Option 4: Automatically after a brief alert tone
Explanation: This is the correct action as per the Call Waiting (CW) service specifications. Entering 2 followed by SEND within the time-out period explicitly instructs the system to hold the ongoing call and accept the incoming waiting call, effectively managing multiple calls simultaneously. This requires a nuanced understanding of telecom session management, particularly in handling concurrent call scenarios with specific service features like CW.