I assume you are using this configuration to connect a phone and not data outlet.
The RJ11 connector is used for phones and the RJ45 is used for data.
The CAT6 cable has 8 wires and to wire this cable to a RJ45 connector 2 wires on the CAT6 cable are not connected.
Go to this site for a wiring diagram for RJ11 to RJ45.
http://www.google.com.au/imgres?q=rj11+to+rj45+wiring+diagram&hl=en&sa=X&tbm=isch&tbnid=4RlQiCWju6MukM:&imgrefurl=http://ps-2.kev009.com:8081/tl/techlib/manuals/adoclib/aixasync/asycomgd/port128b.htm&docid=zs9vggehEny1kM&w=966&h=680&ei=WWxCTpbYNeL9mAWkpLjVCQ&zoom=1&biw=1016&bih=511
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