Sluggo63:
VIPS, of course.
IIRC, it was " Welcome to VIPS, press one for crew resource scheduling, two for..."
Most folks had the list memorized, so they could press the correct button once the recording commenced.
It was a 1-800 number, but I can't remember it.
Oh, and before cell phones, everyone on reserve had a pager. You had 15 minutes to call back after you were paged.