Natural AI Voice Call Optimisation

I already have a full STT → LLM → TTS → telephony stack in production, yet callers still hear obvious lag, awkward pauses and a robotic tone. I’m not looking for a rebuild; I need an expert who can dive into the existing codebase and tune it for truly human-sounding conversations... (Budget: ₹1500 - ₹12500 INR, Jobs: AI Development, AI Model Development, AI Quality Assurance, AI Voice Agents, Android, Audio Production, Audio Services, Natural Language Processing, Speech Synthesis, Voice Talent)