SV8100 - DTL 6DE-1 speaker phone problem

[msteletech]

Hello,
We are having trouble with NEC SV8100 speaker phone, the incoming caller can barely hear and it cuts out. The phone is setup for handsfree operation (15-16), and the speaker key is activated and MIC light is on. I appreciate any type of help this issue. Now everyone wants a headset due that all phones are having the same problem.
Thanks

 

[belevedere]

The only speakerphone issue we have seen were environmental. AC/heat vents and blowers near or above the desk send the speakerphone into transmit resulting in clipping and poor quality.