10.25.2.7. Called Party Display Suppression (COLR) 
- If a system terminal calls just such a DSS1 station
- the station number and the name of the called party is displayed before an ALERT is transmitted. The COLR service is therefore not possible on system terminals.
- first the ringing tone is injected followed by the busy tone if the DSS1 terminal is busy or does not answer the call. This fact was discovered with cordless stations and declared unacceptable. This behavior cannot, however, be avoided when DSS1 is implemented.
- callback on busy is no longer available for system terminals (there is no busy station). This is also applicable, if there are no available B channels (Feature Call Waiting CW).
- A DSS1 station can call itself (under it's own station number).
- Any DSS1 station in a hunting group is always the terminating station, as it is always idle (for the system). It can, however, report busy. The call is then not transferred to an idle station in the hunting group. Concatenation of hunting group and CFx is therefore performed.
- If this restriction is not desired for certain stations (e.g. cordless), then the MULTRA parameter must not be assigned.