Grandstream FXO FAQ

When I call an outside party and the party puts me on hold with no music or sound, I am disconnected after 60 seconds. Is there a way to change this?

On the FXO-Lines Page there is a setting called Silence Timeout. Set this value to however many seconds you wish to remain connected to a silent line. (A good setting would be 3600s a.k.a. 1 hour).

How do I ensure that the Grandstream is on the latest firmware?

1. Navigate to the Advanced Settings Page
2. Ensure HTTP is selected for the method to upgrade
3. Set Firmware Server Path: to firmware.grandstream.com
4. Set Automatic Upgrade to YES
5. Set Allow DHCP Option 66 to override server to No
6. Click Update at the bottom of the page
7. Click Reboot

The upgrade may take as long as 20min when done through the internet, so allow plenty of time for this. While up- grading the LED will blink. When the LED returns to normal, the device has completed its upgrade.

How do I adjust the Call Volume?

First, please consider that analog lines are supposed to be individually isolated electrically.  This means that you may have to adjust line volumes individually.  Be sure to specify the volume per line if your lines exhibit different electrical characteristics.

In order to adjust the settings:

1. Navigate to the Channel's page
2. Increase Tx to PSTN Audio Gain for issues with external party volume
3. Increase Rx from PSTN Audio Gain for issues with internal party volume

Note that you will have to restart calls in order for changes to be applied.