A fellow phone buff had the honor of picking up and later returning a loaned Call Director set to be used as a prop in a school play he was in. There was no charge; he got it at a local business office.
Every movie and TV show has some telephone props in it, ranging from simple plain sets to large switchboards. Movies that show an office would have numerous phones (ie "All the Presidents Men" which had keysets with glowing lights in them.) Often there were scenes where characters were in a phone booth and a pay phone.
In 1950s-60s sitcoms often the sets were color which were a premium charge back then.
Most of the time (though not always) the equipment was Western Electric. (In some productions AE or Kellogg sets were used).
Obviously Hollywood had a need for a lot of telephone sets, and occasionally working keyset lights. Did the Bell System charge Hollywood for loaners? Did the Bell System provide key system gear to make key lights work? Were special keyset lights required to be seen under floodlights of a scene?
Or did studios own a prop house of various telephone equipment that was used as needed?
Often the sound and light effects were not authentic; sometimes the lights on a keyset didn't flash the way they were supposed to. Often the ringers didn't match the phone. To this day pay phones make a 'ding-ding' sound when coins are dropped even though that was removed years ago.
As an aside, TV productions made extensive use of operator style headsets; all the crew wore a headset to hear orders from the director. Were these supplied by Western Electric? (I saw some made by RCA for studio use.)