Historical clue formulations

• Contacted using a beeper — 2025-05-12
• Called for — 2019-09-15
• Summoned on an intercom, say — 2018-10-30
• Summoned — 2018-07-13
• Summoned, in a way — 2016-12-04
• Flipped (through) — 2015-05-21
• Contacted via beeper — 2015-01-06
• Summoned, in a way — 2014-09-21
• Beeped — 2003-12-16
• Beeped — 2001-02-28
• Summoned — 2000-11-26
• Summoned, on "ER" — 1998-03-26
• Summoned — 1997-03-27
• Summoned — 1994-11-16