Customers forgive a lot, but not a phone agent that talks over them or pauses for three awkward seconds. Natural voice is an engineering problem before it is a content one.
The three things callers notice
Response latency, the ability to be interrupted (barge-in), and prosody — the rhythm and emphasis of speech. Get these wrong and no script sounds human.
- Stream responses so the agent starts speaking before it finishes thinking.
- Support barge-in so callers can cut in naturally.
- Shape prosody to the language and the moment.
When these line up, callers stop performing for the machine and just talk — and resolution rates climb.