Skip to main content
Voice selection has a bigger impact than most teams expect. Before the agent’s logic, before the prompt structure, and before objection handling, the contact is already reacting to how the agent sounds. If the voice feels unnatural, mismatched, or off-putting, conversion can drop before the script has a chance to do its job.

​
Match the voice to the audience

The right voice depends on who the agent is speaking to and what the call is trying to achieve. As a general rule:
  • a warm, professional female voice often works well for healthcare and appointment-based calls,
  • a confident, energetic voice can work well for recruitment and lead generation,
  • a calm, measured tone is often better suited to financial services or more sensitive conversations.
There is no universal best voice. The right choice is the one that feels natural and credible to your target audience.

​
Test before committing

Do not choose a voice based on metadata alone. Listen to multiple options, narrow them down to two or three, and test them in real conversations. A voice that sounds good in a short preview may feel very different across a full live call. The best way to choose is to compare voices against the actual use case, not just the sample.

​
Adjust pacing carefully

Voice speed also affects how the agent is perceived. Faster pacing can work well for energetic outreach or time-sensitive flows. Slower pacing is often better for premium, support, or trust-sensitive conversations. The key is to avoid unnatural pacing. If the voice sounds rushed, delayed, or awkward during a test call, your contacts will notice it immediately.

​
Test voice and model together

Voice should not be tested in isolation. The same voice can sound noticeably different depending on which language model is driving the conversation. Timing, phrasing, and overall delivery can all change based on the underlying model. For that reason, test your chosen voices with the actual model or voice stack you plan to use in production before finalising the setup.

​
Best practice

A strong voice setup should feel:
  • natural for the audience,
  • appropriate for the industry,
  • aligned with the goal of the call,
  • and smooth at the chosen speed and model combination.
A good voice makes the agent easier to trust. A poor one creates friction that is difficult to recover from later in the conversation.