The device features 38 fully programmable DSS keys, each
with a dual-color LED, connected to and controlled by the IP Phone via a
RJ-11 cable line. With the ability to connect up to 6 Expansion Board
to a Yealink IP Phone, 228 additional programmable extensions are
supported.
Yealink advanced IP phones support advanced IP-PBX
functions such as speed dialing, BLF/BLA, intercom, call
forward/transfer/hold/park/pickup/return on each of the programmable
buttons on the EXP38.
The EXP38 is compatible for use with the following Yealink IP Phones: