Here in Michigan, since the 90s, it is a "single party" statute. This means any one ("single party") can record a call, permission from the other "party" is not required. Before you had to have a "beep" every 20 seconds to inform the "party" it was being recorded. It's a state by state statute. If I did this to a "party" in another state - that's when the trouble begins. In HK who knows, but I doubt it is illegal as they are so obsessed with surveillance - "Big Brother."
I agree and I believe it is illegal at least in the US to record a conversation without the person's consent. I know I have heard that message "this call is being recorded", etc. many times.
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