hi, I can give you a working demo of auto calling and playing audio messages, for Indian calling you would need Indian SIP trunk or FXO card with local PSTN lines,
for text to speech we can use Google voice API, it's a paid service from google,
what I don't have is a reseller GUI, I can get these things ready in 10-15 days,
kindly let me know if we can discuss this in details,
Regards,