CALL-PROGRESS TONES: DIAL 2 (Australia)
DIAL TONE: A tone advising that the exchange is ready to receive call information and inviting the user to start sending call information.
This tone is indicative of the Australian PSTN. Centrex services provided by some carriers and carriage service providers may apply tones with different cadences in some circumstances.
Frequency in Hz: 400, 425, and 450 given simultaneously and continuously.
Duration: 30 seconds.
Source: ETSI TR 101 041-2 V1.1.1 (1997-05) Technical Report.
AUSTRALIAN STANDARD AS/CA S002:2010
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