Voice-Activated Auto-Dialer Integration

I need a small, self-contained kit that listens for a spoken trigger phrase, seizes my existing internet-based phone line, automatically dials a list of mobile and land-line numbers, plays a pre-recorded announcement, then transfers the caller straight to a live operator or secondary number... (Budget: $250 - $750 USD, Jobs: Asterisk PBX, Embedded Systems, Linux, Raspberry Pi, SIP, Twilio, Voice Talent, VoIP)