Speed matters because the enquirer is usually comparing. A lead called back in ten minutes is a conversation about their plans. The same lead called that evening is a conversation about who they already spoke to. We control the delivery. The callback is yours, so agree who is on the phone and when before the campaign starts.
Two things to have ready. Map the fields into your CRM before day one, so the first record lands in the right place. And keep notes on each call, because a lead that turns out to be wrong is reviewed within five business days, and a line about what happened is usually all the review needs. How the campaign runs around delivery is under property lead generation; project sales teams with long settlements should also read off the plan leads.