Yealink T48S Skype For Business Edition User Manual page 123

Basic Call Features
Add the delegates you want to ring simultaneously when you receive an incoming
call. You can also specify that after how many seconds the delegate's phone rings.
c) If you select My Team-Call Group:
Add the contacts into the Team-Call Group. All members in the group will ring
simultaneously when you receive an incoming call. You can also specify that after
how many seconds the delegate's phone rings.
For more information on how to assign a distinct ringtone to Team-Call group, refer
to Team-Call Ringtone on page 124.
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