Yealink T46G Skype For Business Edition User Manual page 208

User Guide for the T46G Skype for Business phone
If you want to connect two or more expansion modules, connect two expansion modules as
below:
Connecting two expansion modules on a single phone is shown as below:
Connect the Ext jack of the Skype for Business phone and the Ext in jack of the expansion
3.
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
Up to six expansion modules can be connected to the T46G Skype for Business 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.
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