The station initially operated under the name Radio Assel, but also became known under the name Radio Hoog Buurlo. ‘Kootwijk Radio’ was the international call sign for radio traffic. Queen Emma brought about the first telephone connection in 1929 with the Dutch East Indies with the legendary words: “Hello Bandoeng Hello Bandoeng! Can you hear me?“. The first conversations, which invariably concluded with the Dutch national anthem Wilhelmus, were free as it was still in an experimental phase. Subsequently, people had to pay considerable amounts for a phone call to family members overseas.
via http://www.hierradiokootwijk.nl/p/english