Why don't you simply give them separate extensions and put them in a ring group.
Or disable call waiting on this phone, and forward the second call using Call Forward On Busy to a queue, where MoH file will be a busy phone signal. Called will hear a busy phone signal and the second phone will still be ringing.
But whats the point to make the second phone ring if caller is hearing a busy tone. He'll hang up anyways.
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