QCan I use another power adaptor other than the one supplied by the manufacture for the ATA or IP Phone.    ANO. You must use the adaptor provided by the manufacture of the device. If you use another power adaptor you will destroy the ATA or IP Phone. This will void all warranties and will not work. Many times the power adaptor may look the same and fit the same plug but do not use another adaptor execpt the one provided with your specific ATA or IP Phone.