Ok I've searched the forums and I'm not finding my problem listed here. I have used the elastix endpoint configurator (Latest release on X64). Elastix finds my polycom phone, select IP 550, and associate with extension. I have checked and the configuration file and reg files are being written to the /tftpboot directory. I factory reset the phone (it goes to last config because it can't find the boot esrver. Then went into admin menu and set server to tftp, added proper IP address, added username and password for that extension. Then rebooted the phone. Still can't find boot server and it reloads it's old config. I also tried this same process, keeping the username and password as set by factory default. That doesn't work either. Hope someone can help I have to convert a small system of about 30 phones.