Yealink EXP40 - Manual (Page 12)

Yealink EXP40 User Guide
4
3. Connect the Ext jack of the IP phone and the Ext in jack of the expansion module
using one supplied cord.
If you connect two expansion modules, connect the Ext out jack of the previous
expansion module and the Ext in jack of the second expansion module using
another supplied cord.
Note
To attach the stand of the expansion module:
a) Wall mount method (Optional)
b) Desk mount method
Up to six expansion modules can be connected to the T4 6G IP phone. If you 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.