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Lync 2010 and Polcom CX300 intial microphone volume low then increases

Occasional Visitor

Lync 2010 and Polcom CX300 intial microphone volume low then increases

We have just completed a deployment of Lync 2010 primarily using CX300 phones and Win 7 PC's. We are experiencing an issue where the microphone volume of the person using the CX300 is quiet for a few seconds and then increases to a higher level.

I have made sure that all power management is turned off for the USB ports but this seems to have made no difference. The behaviour occurs with internal and external calls but seems only to happen when the CX300 is used in conjunction with Lync. I have carried out some more test detailed bellow


Lync Client 4.0.7577.4103


Record using CX300 and windows sound recorder = No change in volume


Use a basic non certified USB microphone with Lync = No change in volume


Use an IP phone with Lync = No change in Volume


Use a CX300 with Lync = Low microphone volume increasing after a couple of sec.


Does the phone do some volume adjustments when used in conjunction with Lync?

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Polycom Employee & Community Manager

Re: Lync 2010 and Polycom CX300 intial microphone volume low then increases


welcome to the Polycom Community.

From a Polycom Support Perspective you may be better advised to post this in a Microsoft community as the device completely relies on the LYNC Client and the Operating System from Microsoft.


Other members of the community may be able to post some advise as well.

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier

Polycom Global Services

The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. All posts and words are my own & do not represent the views of Employer.


Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
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