Yealink CP860 User Manual page 25

To connect the expansion microphone:
Connect the free end of the optional expansion microphone cable to one of the MIC ports
1.
on the phone.
Note Up to two expansion microphones can be connected to an IP conference phone.
Positioning the CP860 and the Expansion Microphone CPE80
The microphone reception of the CP860 conference phone is ideal when placed within 3m of
any speaker. The better reception is within 2m.
(CP860)
Getting Started
13