It's not a big deal for the head of Air Force Operations. He sounds relaxed on the line as he chats with two colleagues about the "mega" view from his room, and how he's just come back from a drink at a nearby hotel where there's an incredible swimming pool.
"Not too shabby," one of them remarks.
Finally, the boss, Lieutenant General Ingo Gerhartz, dials in - and they begin. Over the next 40 minutes, the group appear to touch upon highly sensitive military issues, including the ongoing debate over whether Germany should send Taurus cruise missiles to Ukraine.
What none of the call's participants know is that they're being eavesdropped on - and their conversation is being recorded.
Two weeks after the call took place, the audio tape was leaked by Russia's state-run RT channel.
Germany hasn't said whether they believe the recording may have been tampered with - but they have confirmed that the call did take place and that it was intercepted by, they believe, Russian spies.
Their man in Singapore had, according to the German government, sprung "a data leak".
While he hasn't been officially named, it's implied that it was Frank Gräfe who accidentally let spies onto the call.
Soon, their supposedly top-secret discussion spilled out via Russian state media and echoed across the world.
