the more details you provide in the post the more chances anyone else has to provide you some feedback.
Is this a new issue or has this always been the case?
Is this a call via an internal or external network?
Is this H.323, SIP or LYNC?
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
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