iPhone 13 (iOS 16.1) Strange WiFi calling behaviour in airplane mode (Video Attached)

Hi all,

Aim: Getting Jio WiFi and Airtel WiFi to work in Airplane mode.

I have done the following test -

#Jio WiFi and Airtel WiFi

#Broadband is Airtel Extreme Fiber.

The steps are -

1. Ensure WiFi calling is enabled and available.
2. Make a call, and turn on airplane mode.
3. WiFi call takes over and the call continues.
4. Accept the call, call continues.
5. Disconnect the call from the other phone, immediately the “Jio WiFi/Airtel WiFi” goes off.
6. You can no longer make a call (asks to disable airplane mode).
7. Disable airplane mode, both Jio WiFi and Airtel WiFi comes back.

Demonstration Video: https://www.youtube.com/shorts/-c65GfJ5wjY

Can some one else confirm if they too see this behaviour?

If so, is this a bug in iOS or is it something being done by Airtel/Jio?

I suspect this to be a bug coz, if Jio/Airtel was blocking this, the automatic takeover in airplane mode would not have happened.

Regards,

Priyabrata