CNG not detected in fax call

Hi,
When using on-ramp t.37 gateway to detect fax calls, using the script called "app_fax_detect.2.1.2.2.tcl" the CNG is not detected.
DTMF activation (pressing 2) works, but CNG is not detected.
Any ideas ?
Avner.

Check the below link for configuraing fax detction
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide_chapter09186a00800b5dc4.html

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