Technical Support Phone Portal

I need a straightforward phone portal dedicated to technical support. When customers call, the system should guide them through a clear voice menu, offer self-service troubleshooting where possible, and route them to a live agent when needed... (Budget: €750 - €1500 EUR, Jobs: Asterisk PBX, Cloud Computing, Mobile App Development, PHP, Plivo, Technical Support, Twilio, VoIP)