How to block incoming calls on BSNL landine

Hello friends,
I need suggestion to block unwanted calls on my bsnl landline phone. I am talking about feature we seeiin mobile where if I want to blcock a number, I simply add that number in blacklist and I iwill then not get call from that number .. can I do similar in my bsnl landline connection. I searched online and all places but can't find any way to do it. I sthere any way from bsnl that they provide this service. Any devices or may be some special number which set it on bsnl itself to drop calls from certain number coming to my landline ..


Thank you folks.. waiting for reply.

I don't think you can do that, atleasat I am not aware of any such service offered by BSNL on landline phone. May be you need to search for some reciever / phoneset which allows you to block calls .