Yeh, I tried the reset several times, no good. Theres only one bit in programming which turns CID on or off for each ext. Telco was sending info so I was ready to try anything.Have to admit I was a bit skeptical when engineer told me that. This wasnt an XBlue engineer by the way, he was with Telco Depot where the system was purchased and it was out of warranty.Another thing that occured to me afterwards, this was a 100+ year old house, may not have even had a 3rd wire ground although the outlets were 3 prong.