Yealink T31W - How to use?

Yealink T31W - How to use?
การใช้งานหัวเครื่อง IP-Phone Yealink T31W
........Contents of this video........
00:08 - Intro.
01:10 - Buttons overview.
06:05 - Network connection
09:04 - Making an outbound call.
14:12 - Accepting the inbound call.
15:00 - Transferring the call.
16:14 - Blind transfer call.
17:19 - Attended transfer call.
20:22 - Conferencing the calls.
26:36 - Configure forwarding button.
29:31 - Pickup group.