Place it after a short ringing cue, such as a Discord call, so the call seems real before the announcement takes over, then follow it with a SpongeBob fail sting to underline the wrong-number ending and close the joke.
關於此聲音
This 11-second clip is a clear, recorded female voice delivering a telephone announcement that the number you have called is not available, credited to Anna Hruby. Its steady, official tone feels flat and final, like a call ending before it begins, which makes the familiar message land as both awkward and funny when it interrupts a conversation.