The Voice Agent Margin Curve: Why Call Handling Is the Next Retainer Line

Voice agents are the rare AI category where the value is already measurable before you sell it: call volume, missed-call rate, and handoff accuracy are numbers the client owns. That makes them easier to price than most AI work, and harder to defend once a client learns the inputs. Agencies that build the measurement layer first will own the retainer; agencies that resell a dialer will be compared on per-minute cost alone.