Yealink T46G Skype For Business Edition User Manual page 160

User Guide for the T46G Skype for Business phone
When the first party answers the call, press the Hold soft key to place the call on hold.
2.
Press the NewCall soft key to place a new call.
3.
Enter the number of the third party, and then press the Call soft key.
4.
You can also enter the first few characters of the contact name or the contact number.
Then select the desired contact from the result list, the call will be placed directly.
When the third party answers, press the Conference soft key.
5.
Press
6.
Press the Merge soft key.
7.
The active call and the held call are joined into a conference.
Press the Add soft key, and dial other numbers to invite more parties.
8.
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to select the contact that is held.