The switchboard stands for the mind routing many voices at once. Plugging and unplugging lines is traditionally read as deciding who gets through to you and who is kept on hold.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.