The phone itself has no built in facility to manage a internal conference and mute individual lines.
What you most likely are talking about is the ability to dial into a bridge and be a chair person and use star ( * ) or hash/pound ( # ) codes to control the meeting.
You meeting provider would need to supply these to you.
As the phone can only hold a 3 party conference it should not be to difficult to advise the two other parties to mute their end.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
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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.
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