On-Premise Speech AI Receptionist

I need a fully local, speech-to-speech AI receptionist that can receive phone calls on Windows and or Linux machines without relying on any external cloud calls/subscriptions. The assistant must be able... (Budget: $500 - $3000 AUD, Jobs: AI Chatbot, AI Development, Audio Processing, Machine Learning (ML), Natural Language Processing, Software Development, Speech Recognition, Voice Agents, VoIP, Wireless)