Hello buenyamin.demirezen@mtu.de ,
Welcome back to the Poly Community.
Please ensure you always provide the currently used software version and the mode the phone is in. Also, try and include the configuration used and/or a backup.
From our FAQ:
Jan 25, 2015 Question:Can I disable the USB port on a Poly VVX / CCX Phone?
Resolution: Please check this post => here <=
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
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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. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.
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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
