CALL-PROGRESS TONES: Second dial tone (Singapore, obsolete)

SECOND DIAL TONE: A tone advising the caller that the network has accepted the call information already sent and asking the caller to provide more information (from CCITT Recommendation E.182 [15])

Frequency in Hz: 425.
cadence in seconds: 4x(0.2 on 0.2 off 0.6 on 0.2 off) + continuous.



Source: ETSI TR 101 041-2 V1.1.1 (1997-05) Technical Report.
Annex to ITU Operational Bulletin No. 955 – 1.V.2010.






#phonecall #phonetone #dialtone #soundeffects #sfx

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