2N Omega Lite - Configuration Tool manual v1.8 - Manual (Page 47)

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2.3.1.3. 2N StarPoint 500
It can also be set with the connected extenders (19 buttons = Advance telephone
type + 1x90 button Extender), up to 109 programmable buttons. Overall number of
all programmable buttons can be up to 460 for the entire system.
For 2N StarPoint telephones it is possible to select from several ringtone melodies.
The melodies for individual types of calls can be assigned in the environment PBX
Configuration tool /system lines /buttons/user settings.