Is this a day one issue or has this recently changed due to a firmware upgrade?
Are this external calls only or internal/external?
What type of headset with what connection to the phone?
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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