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I bought TL-MR3420 to use it mainly as 3 G router for while, but I found a problem when switch it to be used for WAN (ADSL) connection,, When I connect it after splitter , internet connection established but i can't use my landline (goes down).. I have tested with 2 different routers and splitters , i can use both internet connection and landline on same time...

Is there any thing can do to solve this problem ?

Thank you