CALL-PROGRESS TONES: RINGING/RINGBACK A (Canada)
RINGING TONE: The auditory indication to be presented to a user to indicate that a connection has been made and that an alerting signal is being applied to the called terminal or service (this definition is consistent with CCITT Recommendation E.182 [15]).
Frequency in Hz: 440 and 480 given simultaneously.
Cadence in seconds: 2.0 on 4.0 off.
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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