KEY CONFERENCE Y KEY REDIAL IN TELF IP MODEL 1220

[wilamy]

In the IP phone Model 1220, is the key CONFERENCE and REDIAL key. non-programmable, are fixed.
But I can not get work.

NOTE: If configure any of the other keys as AO6, if it works, but the key with the name, CONFERENCE AND REDIAL not.
any tips, trick or stupid I'm missing

( SEE LINK, is the key with 3 human figures )