Hello mrog,
welcome to the Polycom Community.
The CX500 is classed as a Common Area Phone for Microsoft® Lync™ Server 2010 and the Data Sheet => here <= clearly states that it is:
Audio—Speaker
• Monitor Only Speaker
The CX600 supports Hands free mode but the CX500 has a speaker only.
The Microphone Button is used to mute a call as described in the User Guide => here <=
Best Regards
Steffen Baier
Polycom Global Services
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If official support is required please check how to phone or open a case here
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The title Poly 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.
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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
