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Northstar
8+ years now. I don't think age as anything to do with it, its a policy and would be imposed on every one.
I asked him, when the MAC was bound. He said non-bound routers can be used. Just need to call the CC and disengage the current one. Will let you know, when I change it and/or it burns out.
How old is your connection. Maybe MAC binding is a new protocol for Airtel.