When i press the green call button of R28, the button works like cancel button. When i press the red cancel button, the button works like dial button. These buttons work reverse. How can we fix this?

R28's CALL and CANCAL buttons' position in the keypad are changed once when designing.
There is one option for configuring two keys in the Intercom->Advanced interface.
Enabled: CANCEL button is in the upside.
Disabled: CALL button is in the upside.