I have Redmi note 3. I am using Jio and BSNL sims. I have observed that since last 3-4 months, whenever I tried to make call to few Jio numbers, it shows call ended immediately on calling. The same number working fine from BSNL. What could be the issue? I have checked one more jio sim in the phone. It is having the same issue. So the issue is in phone not sim.
https://www.desidime.com/discussions/need-suggestion-for-jio-call-ended-on-redmi-note-3?page=1#post_6109124
Issue could be related to 4G VoLTE service