Land Line disconnects when plug TL-MR3420 V2.4

Land Line disconnects when plug TL-MR3420 V2.4
Land Line disconnects when plug TL-MR3420 V2.4
2016-09-17 21:38:09
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Firmware Version :

ISP :

I have ADSL line and when connect this router after splitter , found the land line is down.. i tried with another 2 different routers & Splitters , land line and Internet connection are up without any problem... I was using TL-MR3420 mainly as 3G router and it works, but i discovered this problem when i switched it to ADSL (WAN)..

I upgraded the firmware also but still same problem

Is this related to ISP or Router configuration or the device itself is fault ?
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