The value of tmnxMcPathVdoPlcyRTPayloadType specifies the format to
be used by Retransmission (RT) server to send retransmission packets.
The default value '99' indicates that the frames will be sent in the
RFC 4588 format.
A value between 96 and 127 indicates the dynamic payload type value
(as per RFC 3551) to be used for RFC 4588 formatted retransmission
packets. A value of 33 indicates a mpeg-ts payload.
The value of tmnxMcPathVdoPlcyRTPayloadType is only applicable when
tmnxMcPathVdoPlcyChlType is set to 'default (1)'.