Yealink CP960 Skype for Business - Page 107

Basic Call Features
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Merge all calls into a conference via phone user interface:
1. During multiple calls, tap Merge calls.
All calls are merged into a conference call.
Note
Merging an Active Call and a Held Call into a Conference Call
If you do not want to merge all calls into a conference call, and just want to merge two
individual calls into a conference call, you can do the following:
Multiple conferences cannot be merged into one conference call.