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### Answer To address the issue where the voice does not correctly read double letters or digits in emails and numbers, consider implementing custom logic to handle the pronunciation of these elements explicitly. This can be done by adjusting the prompts or by configuring the text-to-speech settings in the voice provider configuration. Since you're using PlayHT as your voice provider with Vapi, you might want to check if there are specific settings or parameters that can be adjusted to improve the pronunciation accuracy. Sometimes, ensuring that characters or digits are spaced or represented in a way that the TTS engine can recognize as distinct entities might help. Additionally, you may want to contact PlayHT support or refer to their documentation to see if there are recommendations for handling such cases or if any updates are available that might improve the pronunciation accuracy. If the problem persists, consider experimenting with different voice models or providers to see if they handle pronunciation of double letters and digits more effectively. For more detailed assistance on configuring your voice setup or troubleshooting specific issues with Vapi, visiting the corresponding sections in the Vapi documentation or contacting their support might provide further guidance.

Got it. Tagging @User for additional help.

Cause it is the issue from Transcriber side as well.

You need to wait for GPT-4o launches it's voice to voice model.

thanks