Two kinds of number
You can rent numbers through Fuse, or add a number your business already owns. They are not equivalent.
Rented numbers are the fuller option, because Fuse manages them end to end and can tie them to your approved business profile. A number you already own is worth adding when your contacts recognize it.
Which number a call goes out on
For single dialing you can pick a specific number yourself, or hand the choice to Fuse. Parallel dialing always hands the choice to Fuse, so call volume is spread across every number you have available. When Fuse chooses, it looks for continuity first. If the contact has been called before, Fuse reuses the number from the most recent successful attempt, so they see a caller ID they have seen from you already. Only when there is no number to reuse does it fall back to the automatic mode you selected, either Randomized Area Code or Closest Local Area Code.A number rated unsatisfactory is left out of automatic selection, and is not reused for continuity either. See business registration and number health.
Where to go next
Your phone numbers
Renting a number through Fuse, or adding one you already own.
How Fuse picks a number
Contact continuity, and the two automatic modes.
Business registration and number health
What registration buys you, what it cannot promise, and what pauses dialing.