Asterisk IVR + SIP Setup

I have an Asterisk instance that needs a fully functional IVR linked to our SIP trunks. The core requirement is simple: callers should be greeted, routed through a concise menu, and seamlessly bridged to the correct internal extensions or external numbers... (Budget: $250 - $750 USD, Jobs: Asterisk PBX, Linux, SIP, Software Architecture, Telecom Sales, Telecommunications Engineering, Telecoms Engineering, VoIP)