How do you make voice AI clearly repeat phone numbers & prices on calls?

Hey everyone,

I’m building a live AI phone receptionist and I’m facing an issue when the assistant has to repeat numbers back to the caller.

Problems:

• When a caller gives an 11-digit phone number → digits merge or sound unclear

• When repeating prices like £1500 → pronunciation sounds distorted

• Works fine sometimes, but inconsistent on real phone calls

Stack: Vapi + Twilio + n8n + ElevenLabs (also tested Gemini/OpenAI)

Tried already :

– Increasing end-of-turn timeout (0.5 → 2s)

– Changing voices/models/LLMs

How do you normally solve this in production systems?

Is it formatting, TTS settings, buffering, or another approach?

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