In voice agents, the TTS voice can fall back mid‑call if there’s a runtime interruption (latency, retry, barge‑in, language detection, or model failover).
Even when a female voice is configured, some response paths may use a default system voice if the primary voice becomes unavailable.
You can reduce how often this happens by locking the language/locale and avoiding “auto” voice settings, but currently there’s no guaranteed way to prevent fallback entirely.
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