They used to operate this way in the UK - the line would stay occupied until the call initiator hung up. We used to play with this when I was a kid, but I've not had a landline since early 2000s, so I've no idea if this survived the transition to digital exchanges. TBH I doubt it, and I know lots of people complained about it, because it was really annoying if someone who'd called you hadn't hung up properly as then you couldn't make any further calls yourself.