Figure 10: Method 1 - Configure Fxo Port On The Gxw410X: Call Progress Tones; Figure 11: Method 1 - Configure Fxo Port On The Gxw410X: Fxo Termination - Grandstream Networks UCM6100 User Manual


First we should confirm which method the PSTN line is using. If the PSTN line is using current
disconnect (typical case in North America), then we should turn on "Enable Current Disconnect"
and disable "Enable PSTN Disconnect Tone Detection". The default "Current Disconnect
Threshold" value is 100ms, but if you start experiencing call drop then you should raise this value
by 100ms intervals.

If the PSTN disconnects using the tones method, then turn on "Enable PSTN Disconnect Tone
Detection" and turn off the "Enable Current Disconnect" option.

Figure 10: Method 1 - Configure FXO Port on the GXW410X: Call Progress Tones

For PSTN tone detection, the tone disconnect method is widely used everywhere else in the world.
The North American busy tone value is "f1=480@-32,f2=620@-32,c=500/500" but these tones vary
from country to country. You may look up for the settings for your country at www.3amsystems.com or
download the information from

Figure 11: Method 1 - Configure FXO Port on the GXW410X: FXO Termination


Set "Number of Rings" option to 1. If you happen to experience caller ID issue, you may set it to 2.
In the sample setup, it's set to 2.

Set the "Wait for Dial-Tone" to "No".

Set the "Stage Method (1/2)" to 1.
http://www.itu.int/ITU-T/inr/forms/files/tones-0203.pdf
CONFIGURING UCM6100 WITH GXW410X Page 9 of 13