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Most Popular Plantronics CALISTO P540M Questions

Digital Display Lit But Lettering Is Not Visible.
Over last 2 weeks my Calisto P540M digital display information began to "fade" and is now completely...
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Can I Make/receive Calls When I Am Not Signed-in On Lync?
Does it require Microsoft Lync to run on the PC to make and/or receive calls?
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We have the following 1 documents available for the Plantronics CALISTO P540M:
  • User Guide
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