If you use CMS at all, you can also log that extension (assuming it's a hard station) in as an agent. We occasionally log in our non-call center folks as agents when we want to track the number of in/outbound calls they are making. Then you can use standard CMS/Call Center Supervisor/NICE Analyzer reports to pull stats... You're not going to get as much data as a call accounting program, but you can start to get some idea of what's going on.