Historical clue formulations

• Call it! — 2026-05-02
• "Red telephone," historically — 2025-03-09
• Crisis center phone service — 2017-06-21
• Red telephone's connection — 2009-11-25
• Critical link — 2002-06-07
• 800 number, perhaps — 2001-04-20
• Aid in a crisis — 2000-02-18
• White House connection — 1996-08-24