Change to this setting:
Physical Interfaces > LINE Port > RingDelay: 0
To make the changes select your Obi in Obi Dashboard, then Obi Expert Configuration, then Enter Obi Expert. In each case where you want to change a value, first uncheck both the boxes to the right of that value and leave them unchecked. When you have finished making changes, press submit and wait a few minutes for the Obi to reboot.