HI ,
I got REGISTRATION_EXPIRED or TTL_EXPIRED events from EndpointUnregisteredEvent when I am using MR DMCC recording

Can you helps what may be the root cause of the two events and what they will effect my recording

Thanks a lot

As I understand what you have said, received an EndpointUnregisteredEvent. Thus your associated recorder is no longer registered with Communication Manager. While Communication Manager will leave it in the existing call for a period of time (your recorder may or may not continue to receive RTP packets, you are in the best position to understand that), you will not be able to add the recorder to any future calls until you get it re-registered.