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...i/1 for span 1 I see still the VPM450 entry near the channel although this was a fax call with CED tone. 1 TE4/0/1/1 Clear (In use) (EC: VPM450M) Greping through the source, i see only a CED tone detection entry in: static const struct dahdi_echocan_features vpm450m_ec_features = { .NLP_automatic = 1, .CED_tx_detect = 1, .CED_rx_detect = 1, }; Does it mean that CNG tone is not going to be detected ? Does the CED tone detection routine also detect ANSam tone for Super G3 fax ? Thanks Regards Hans