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7975G noise/interference issue during call

Hi,

On a recent install, we used several CP-7575G phones with the UC560.  There is a mix of 7975Gs and 508Gs.  On the 7975s, when there is silence on a call, the 7975 user can hear noise - to us it sounds like a modem negotiating faintly in the background and loops endlessly.  You hear light (ordinary) static/hissing on the 508s but cannot hear this same sound.  This customer is using a SIP trunk and there is not any analog involved. 

We tested against several different phone types (cell/land) on the other end to ensure it wasn't coming from the other side. The other party could not hear anything.

Could it be because the 7975G is a "wideband" device and it's picking up other noise you wouldn't normally hear?

It would figure, the users heard it within the first 5 minutes of getting their new phones.  Any suggestions?

Thanks.

Joe

1 REPLY
New Member

Re: 7975G noise/interference issue during call

Just FYI.  A current firmware update appears to have fixed the issue.

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