| Clue | Source | Date |
|---|---|---|
| Means of communication without interference | New York Times | 24 Nov 2019 |
| Means of communication without interference | ||
| Link between heads of state, say | USA Today | 15 Jan 2018 |
| Link between heads of state, say | ||
| Privileged connection | ||
| Privileged connection | ||
| Private phone connection | ||
| Private phone connection | ||
| Shortest path | ||
| Telephonic convenience | ||
| Private diplomatic wire. |