Digital and UNIStim endpoints require the Transfer button or soft key to be programmed. Soft keys have a fixed location as position 17. The UNIStim and digital 200X station programmable buttons do not. Note that 3901 has the feature assigned to a button at position 1 to 4, but the user presses the feature button and enters the digit aligning to the button. The 3902 stations must have either conference or transfer configured at position 4 and cannot assign it elsewhere. This is also done on the System Manager or the Communication Manager configuration pages, but the type of station must be the appropriate station family: CS1k-IP, CS1k-39xx, CS1k-1col or CS1k-2col.