I have a similar problem. Our office has the C6 module, but I don't know if it is installed properly. I have been working here for 8 months, and the whole setup (KSU 6x16) seemed to be screwy. We called 2 different installers to fix it, but neither could get the caller id working properly. I know that AA has to be set up for 2 rings, but we don't see caller display on any phones yet, even if we use the F811. Does anyone have any ideas, or any pointers on how to properly install the C6?
Thank you in advance.