Yealink T48G-SKYPE FOR BUSINESS EDITION User Manual page 182

User Guide for the T48G Skype for Business phone
You can also enter the first few characters of the contact name or the contact number.
Then click the desired contact from the result list, the call will be placed directly.
When the third party answers, there parties are now joined in the conference.
3.
Click
4.
Repeat the steps 2-3 to add more parties to the conference.
5.
Join Calls into a Conference
Joining Two Calls into a Conference from the Phone
You can join an active call and a held call into a conference call from the phone.
To join two calls into a conference call from the phone:
Place a call to the first party.
1.
168
to invite a new party.