Secondary MSN numbers are always "READY" and cannot be activated either by dependability (DEP) or the AMO DSSU so that the usual disconnect before deletion is obsolete. A secondary MSN number cannot be deleted if it is still contained in a hunt group for a service from the MSN services range (i.e. FAX or DEE in the example). All secondary MSN numbers on the bus are deleted automatically by the AMO if you delete the last functional terminal (DEL-SBCSU:SERVICE=<DEE/FAX>, ...;) ! If you cannot delete a secondary MSN number for whatever reason, you also cannot delete the last functional terminal!