How are you integrating the Chime to your NVR? Onvif? There is a bug where the RTSP stream will freeze when the button is pressed. I reported this to Control4, but it wasn’t even acknowledged. There no reference number that I’m aware of. The only way to fix this is to use the RTSP URL directly and not the Onvif profile. Also, you need to use the main stream for recording, since the issue is in the Substream.
Also, in my NVR I use the main stream URL for both the main stream and the Substream.