The version of firmware (6.08-6.09) does not have 'FXO disconnect on Call Progress Tone', please help me.

The "FXO Disconnect on Call Progress Tone" parameter is in a different location in firmware versions 6.08 and newer.

Begin by going to Configuration ->Interface for the voip FXO channels. Click on the Supervision button in the bottom-right corner of the Interface page.

Once on the Supervision page, enable Tone Detection under Disconnect Supervision at the bottom of the page.

Click OK on the Supervision page to return you to the Interface page.

Once back on the Interface page, click Copy Channel to copy the Supervision parameters to the other FXO channels on the same voip. Click OK on the Interface page after doing this.