Good day.
There are no restrictions for streams in the trial version. With RTSP stream you can:
1. Capturing RTSP stream and publishing to the server (described in documentation)
2. Playing a RTSP stream from the server (described in documentation)
Please, tell us more details about your case. If possible, send us RTSP URL of your stream (if your capturing RTSP to the server) to support@flashphoner.com.