Assertion: busy tone | /r/MadeOf | single 400 hz tone
Facets:
value: in the united kingdom
type: LOCATION
Source sentences:
text: In the United Kingdom, busy tone consists of a single 400 Hz tone with equal 0.375 s on/off periods.
text: In the United Kingdom, busy tone consists of a single 400 Hz tone with equal 0.375 s on/off periods.