Does the part number under the phone say TR3015-71 or just 3015-71. If it has TR3015-71 it will work on a Triad-S system with the latest software that they had. If it says IN3015-71 or just 3015-71 it would work on the Infinite Mach 1 (Same as Triad-S but with different software), DVX Plus 2, DVX Plus 3, DVX Plus 4, STS (Gold Version), STSe (Gold Version), XTS,XTSc,MBX.


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