which netgear modem is compatible with MTNL triband coz the MTNL triband head for my area told me to either go for dlink DSL502t of which production has been stopped or to go for netgear.he did not know the exact model no.he said that u should not go for GLB502t as many users are having problems.also, im in mumbai so please tell me where i can get it and at what cost.