Airtel — Airtel does not allow calls to Jio

I see that whenever I try to call a Jio number from my Airtel, the phone does not even go through to a ring. It just disconnects without even connecting to a network and I do not even get a message of not reachable etc. While on the other side the phone is within network, and I can call to a BSNL on my friends dual sim. Also, the same time my friends are able to call back if I send an SMS stating I am not able to call. This is not an issue with one person, so I have generalised that its Airtel stopping Jio. We have testing this with keeping the phones on the same table at the restaurant. Also I can reach my friend's Jio number from my BSNL dual sim. So there is no reason why Jio calls does not go through from my Airtel Sim.