Yealink T43U BLF

I have S20 with one FXO and 2 extensions T31P & T43U. BLF& SpeedDial on T31P is working fine, i can monitor & call 1002 (T43U) by simply pressing the dss key or speeddial with the other dss key .But i can not setup the same for T43U, it says calling 1000 (T31P) and does nothing. I can not also setup the speedDial on T43U, if i call normally an extension or a number its fine, but i can not configure DSS.  


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