What does iphone 6 busy signal sound like?

Does it sound like a traditional busy signal or does it ring a couple of times and go to voicemail?

Busy signals are generated by the receiving party's carrier. Has nothing to do with the type of phone you have.
Voicemail is carrier provided and again, has nothing to do with the phone you have.

The receiver chooses to have voicemail and whether or not to use it.

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