仅内部使用
Tip#14
Three-way Call
•
During an established call, user can make
second call by (1) press call-out ‘ ‘ button,
(2) line key.
•
User can join two calls into call conference by
pressing Join ‘ ‘ button, and split calls back
to two separated calls by pressing Split
‘ ‘ button.
•
If user hang up the call during conference
(joined), both party will be disconnected.