The below illustration is for a RealPresence Trio when used with a SIP Server. Utilizing a LYNC / Skype for Business server are similar.
- Dialing the First caller and selecting Add for an additional call

- Select Merge Calls to join the original caller and the new caller

- The currrent participants of the call can be seen

- Tapping the conference on the Top allows additional actions or adding more callers (up to the current limit of 5 as shown => here <= if a SIP server is used)

- After adding the maximum amount the Add option is greyed out


- Tapping an individual caller allows to Mute them or Drop them out of the call.

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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.
Please also ensure you always check the VoIP , Video Endpoint , Microsoft Voice , PSTN or other FAQ's in the different sections