Retell Ai /Twilio Voice Assistant Setup

I have a Retell AI account and a Twilio phone number ready to go. The goal is to stand up a fully functional voice assistant that answers incoming calls, speaks fluent English today, and is architected so I can roll out additional languages later without a full rebuild... (Budget: $10 - $30 USD, Jobs: AI Chatbot Development, AI Development, AI Integration, AI Voice Agents, Asterisk PBX, Audio Services, Twilio, Voice Agents, Voice Talent, VoIP)