This instruction was referenced by the following NAVADMINs in the NAVADMIN database. This list is only a partial best guess.
| NAVADMIN | Subject |
|---|---|
| NAVADMIN 287/07 | NATIONAL CALL TO SERVICE (NCS) UPDATE |
| NAVADMIN 033/08 | NATIONAL CALL TO SERVICE (NCS) UPDATE |
| NAVADMIN 007/09 | CONTROL OF CONDITIONAL SHORT TERM EXTENSIONS |