Land Line goes down when plug TL-MR3420 V2.4

Land Line goes down when plug TL-MR3420 V2.4
Land Line goes down when plug TL-MR3420 V2.4
2016-09-17 21:52:23
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Hardware Version :

Firmware Version :

ISP :

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
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