I can make call using twilio programmable call as my python code here
The calls sometimes result as no-answer or busy i.e. the call get rejected or not-answered.
My google search here and search on our stackoverflow site here found little helpful result so I asked here - how to repeat calling until get answered?
p.s.
I'm looking for built-in solution from twilio directly e.g. some TwiML xml tag or attribute for callUntilAnswered='true'
Here and here is how I have to code it manually to get the phone call auto-redial.
The main idea there is to keep pinging the api to get call status and detect busy call (ringing after 60s and no answer); redial when it is busy.
p.s.
To run in background and multiple numbers at the same time, the sample code is here