CALL-PROGRESS TONES: Dial tone (Greenland 2)
DIAL TONE: The auditory indication to be presented to a user to indicate that a network connection is available and ready to receive
call information and inviting the user to start sending call or service related information (this definition is consistent with CCITT Recommendation E.182 [15]).
Frequency in Hz: 445.
Cadence in seconds: continuous.
Source: ETSI TR 101 041-2 V1.1.1 (1997-05) Technical Report.
Annex to ITU Operational Bulletin No. 955 – 1.V.2010
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