Contrary to the official historical narratives, Hitler’s bunker was not finished when he moved into it on January 16, 1945. It was hastily fitted and decorated, very damp, cramped, and smelly.
The bunker included a room for a switchboard, which is shown in the plan below as number 24. The switchboard operator shared the room with Hitler’s right hand man, Martin Bormann.
Rochus Misch, one of Hitler’s SS bodyguards, was a switchboard operator for the Reichskanzlei (Reich Chancellery) and also the Führerbunker. Misch wrote the book, Hitler’s Last Witness: The Memoirs of Hitler’s Bodyguard.
Movies depict the Führerbunker as having a large switchboard with many extensions. But, according to Misch’s book, the bunker was wired with only five telephone extensions. It is likely that these extensions were terminated in a bare bones, 5-line switchboard from late in the war. It is also likely that a rotary dial Amtszusatz was connected to the switchboard to access outside lines.
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WW2 German Field Telephone Equipment 