The multicast RTP port (video and audio) numbers must be even numbers in the range of 1026 to
65534 that do not overlap with the unicast RTP port numbers
(except for numbers between 4000 and 5000, 10000, 10001, 38214, and 49152.)
The multicast TTL must be specified in the range of 1 to 255.
Working with Administrator Configuration Screens 7/71