If you need this, there is an undocumented command that lets you see how many calls are in the SMDR buffer, and lets you clear the buffer. DLSD is the command. You probably will not find any information about it, but you can bring it up and look it over without making changes. I have used it at times to clear the buffer and get SMDR working again. Keep in mind that if you clear the buffer you lose all of those records.