The use of honorifics was subtly discouraged at the
Labs. I never saw a
policy statement, but nobody I knew used "Dr" (except
those in the medical
department)
With the sole exception of the president's office, secretaries were
instructed not to say "Dr so-and-so's office" when they picked up an
unanswered phone call. (When that happened you could be sure that
the party you were calling was genuinely unavailable. Part of the
AT&T ethos--now abandoned--was that everybody, right up to the
president, answered their own phones.)
Doug