Good news. My choice landline number was provisioned today.
I was not aware that they configured my ONT using ACS (TR-069) to update the landline number till the Airtel team called this afternoon to confirm that I can enjoy voice call services on the new number.
They further added that this service is free of any charges so I won't need to pay anything additional for this VIP looking number.
I never purchased any VIP number in my life so getting something like that for free was a sweet gesture from Airtel.
The Airtel Thanks app, router’s web interface etc. and everything else has been reflecting my new choice landline number already as per my check. The team also informed that my next bill will have new landline number mentioned.
@Digital Mastermind bro, here's the final update you were looking for.
Many thanks to
@anubhav bro due to whom I got to know about this special service.