Disturbances with Plantronics DSP 400

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Hello,

a DSP has 400 of Plantronics. The DSP lies on my desk and if my mobile phone 10 cm lies far away from it, I hear a Handy humming if a net alignment take place. Also the three DECT station on my desk produce a background noise, which is disturbing.
I spoke straight with the support of Plantronics, which would have heard still nothing of this problem. I am to increase either the distance and return the part.
What says it to it?

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Quotation:

Quotation of lino16 Hello, a DSP has 400 of Plantronics. The DSP lies on my desk and if my mobile phone 10 cm lies far away from it, I hear a Handy humming if a net alignment take place. Also the three DECT station on my desk produce a background noise, which is disturbing. I spoke straight with the support of Plantronics, which would have heard still nothing of this problem. I am to increase either the distance and return the part. What says it to it?

What do you say to it? Did you try already times to increase the distance? It is nevertheless completely logical that the two devices disturb themselves. Normally a paragraph is located also somewhere in operating instructions that one determined devices with a minimum distance set up or use should.