I am working on an IVR system that is supposed to work as a missed call service: users call, it rings for a moment, either they or the system hangs up, and then the system places a call to them. The goal is to avoid charges on their end.

I basically have this working but it doesn’t sound natural on the user’s side. It doesn’t sound like the phone is ringing, there are just two beeps before it disconnects. I am using the ‘hangup’ command, I’ve tried the default and using a CALL_REJECTED status. The latter is worse - I get a voice from the telco saying “the number you are trying to reach is unavailable” (not at all what I want). This is in India for what it’s worth.

Does anyone have experience setting up such a system and advice on the commands I should be using?