Typically all ATA's and IP phones and softphones allow for "call waiting", which allows you to take a second (or more) call while still remaining connected to the first one.
I have a DID with Voxbone that gives two incoming channels as well, that I map to Voxalot. When a second call comes in, on my Sipura I receive a typical call-waiting beep and the second channel can be answered in the same way you would traditionally with call-waiting over the regular phone network.
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