Nortel Networks NN-10300-014 - Manual (Page 70)

Additional features
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Figure 10: Logged on to an IP Audio Conference Phone 2033
using an IP Phone 2004
On the IP Phone 2002 and IP Phone 2004, the feature keys remain empty
(except for the appearance of your DN) because your IP Audio
Conference Phone 2033 does not support feature keys.
A User information line that lists the number of your office telephone
appears on all displays.