Generally speaking, this scenario is caused by a power spike/surge/over-voltage reaching the telephone interface chip (SLIC) inside the OBiTALK device and frying it. This is not something that a company would normally cover under warranty, as it was caused by external/environmental or user error factors. The device is not repairable.
To prevent this in the future: DO NOT connect the telephone jack on the OBi device to your home/office premises wiring, unless you know what you are doing. The premises wiring must be completely disconnected from any telephone service provider's wiring. In plain English, if you had telephone service coming into your building from a traditional telephone company, or digital phone service from a cable or fiber device, then those wires must be disconnected from the point of demarcation (junction box) on your building.
Furthermore, plug the OBiTALK device, and ALL connected equipment, to a reputable-quality surge protector or UPS. That includes the telephone, if it has an AC adapter, the modem, router, switch, and any components plugged into your LAN or telephone wiring.