Nortel Networks NN43111-100 - Manual (Page 25)

Connect the IP Audio Conference Phone 2033 components
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Figure 6: IP Audio Conference Phone 2033 connections
3. To connect an extension microphone, run the microphone cord
through one of the side channels on the bottom of the main unit, and
plug it into one of the extension microphone jacks. See
Figure 6 .
Note: A maximum of two extension microphone jacks are supported.