Why hasn't my iphone automatically hung up on a caller?

Why hasn't my iphone automatically hung up on a caller?

Added (1). I avoid answering unknown callers with my Iphone, and right now I have an inbound caller showing on my phone that I haven't answered. Only issue is that its showing this incoming call for the last 30 minutes! I.e. Its showing that I have a number dialing me and that I can 'slide to answer' for that long - the person whoever it is, hasn't hung up! Is that even possible?! My phone normally goes to voicemail, why hasn't it for this call?

Because you haven't told it to do so. Are we supposed to know what you're babbling about?

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