User Guide

Yealink EXP40 User Guide
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3. Connect the Ext jack on the host phone and the Ext in jack on the expansion module using
one supplied cord.
If you connect two expansion modules, connect the Ext out jack on the prior expansion
module and the Ext in jack on the next expansion module using another supplied cord.
Connecting two expansion modules on a single host phone is shown as below:
Note
Power is automatically transferred from the host phone to the expansion module(s) upon
connection. If you want to use more than two expansion modules on a single phone, you need to
connect an additional power adapter to any one of the expansion modules.