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Fax_Tones

CNG tone

When the originating fax machine calls, it sends a calling terminal identification or CNG tone. As defined in the ITU-T T.30 recommendation, it is a 1100 hz signal. The cadence is half second ON and 3 seconds OFF, i.e., a half second 1100 pulse in every three seconds.

CED tone

When the terminating fax machine answers the call, it sends a called terminal identification or CED tone. As defined in the ITU-T T.30 recommendation, it is a continuous 2100 hz signal with a duration between 2.6 and 4 seconds. Synonym: ANS (Answer)tone.

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Page last modified on June 18, 2010, at 07:34 AM EST
Subject to change without any notice. All rights reserved 2010 - Telesis A.S.
Iskitler Cad. No.68 Ankara, TURKEY. Tel: +90 312 3840540 Fax: +90 312 3840549 http://www.telesis-pbx.com