I would set the device back to factory defaults. If no dial tone then, get an RMA and send the box in for repair.
http://www.obihai.com/legal.html says
Product Warranty & Return Policy
Unless where local law dictates otherwise, Obihai Technology provides a one-year limited hardware warranty. Obihai warrants to customer that this product will conform to its published specifications and will be free from defects in material and workmanship at the time of delivery and for a period of one-year thereafter. Without limiting the foregoing, this warranty does not cover any defect resulting from (a) any design or specification supplied by an entity other than Obihai, (b) non-observance of technical operating parameters (e.g. exceeding limiting values) or (c) misuse, abuse, using in abnormal conditions or alterations of any kind.
After the acceptance of a Return Material Authorization (RMA) request, Obihai will attempt to refund, repair or replace the product. To request an RMA, please contact the party from whom you purchased the product. If you purchased product directly from Obihai and you believe it to still be under warranty, please contact
support@obihai.comAlso see
http://www.obitalk.com/forum/index.php?topic=2685.0