In case of airtel, they give you a static ip for any plan if you pay some extra amount (forgot how much). Check the cust support as my this info is a bit outdated.
I just checked the Tataindicom website & this is what it says...
What are the charges for getting additional Static IPs?
With every Router connection 1 Static IP is provided free. If you wish to avail additional Static Ips you will be charged Rs 2,000/- (service tax extra) per annum per static IP.
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