Place it as the final beat of a call scene, right after the last line of dialogue, then follow it with a reaction sound to show the other person's shock. Pair it with the Discord Call sound at the start of the scene to set up the conversation before the ending.
關於此聲音
This is a short phone hang-up effect, about a second long, with a firm click followed by a flat disconnect tone. It feels abrupt and final, like a conversation cut off mid-sentence, and works as a quick comic full stop. The clipped ending makes it instantly recognisable as someone hanging up.