telephoner

noun

1. A person who telephones, especially one who does so for a commercial organization.

   “TO CALLERS AND TELEPHONERS Consequent on the war and the blackout regulations, as an emergency measure to assist the staff in getting home before it is fully dark, our office hours (without a lunch interval), commencing Monday, November 20, and continuing until Saturday, February 10, 1940, will be : Mondays to Fridays - 9 a.m. till 3.15 p.m. Saturdays - - 9 a.m. till 1 p.m.”

   “After receiving a call in March of 1984, her devoutly Catholic parents followed the telephoner's advice of seeking help, speaking with a priest and two male psychiatrists.”