Polycom CX400 - Manual (Page 13)

Getting Started with Your Polycom® CX400 Cordless Phone
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you are logged in, your account name appears on the graphic display
along with your presence state.
Connecting the Optional Headset
To connect the optional headset:
1. Connect the headset (optional) to the headset jack on the side of the
phone.
The handset accommodates a headset with a 2.5 mm plug.
Polycom recommends the use of a high quality headset for use with the Polycom
CX400 cordless Phone. Any headset with a 2.5 mm plug designed for use with
mobile phones will work with the Polycom CX400 cordless phone. Any of these
headsets may provide adequate performance, but in general they will not provide
the same high quality audio as the Polycom CX400 cordless phone. This is
because they are not designed to work with the same high fidelity, wide audio
bandwidth that the Polycom CX400 cordless phone is designed for.