Nortel Networks 6140 - Manual (Page 47)

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The headset
The headset
Nortel offers optional headsets (depending on market region) for use in noisy
environments or if you need to have your hands free while talking.
To use the headset, plug it into the jack on the bottom of the handset. The headset is
specifically designed for the WLAN Handset 6120 and 6140.
When you receive a call using a headset, the headset and the handset ring.
Use only authorized headsets with WLAN Handset 6120 and 6140.