Well, BSNL has a weird process due to which above confusion has come in. When we opt for new broadband connection, the connection comes with same existing telephone.
But when we opt for new ftth separate telephone number series is allocated, separate bill number etc,along with fibre connection. It's up to the user to activate internet telephony voice calls on new telephone number[it's all free,24x7 to any network].
Old telephone will continue to exist with tariff charged accordingly,like fixed monthly charges,usage charges etc. Ppl will start getting two bills though.
1for old telephone. 1 for new fibre and new telephone(optional activation) under that.
This is something that could be improved by BSNL.