Lost RTCP packets

Hi all -

Just a thought, what is the procedure when RTCP packets are lost between
the client and server. These are fairly important bits of information.
I am experimenting with RTP/RTCP over UDP/IP with a view to adding QoS -
however I just wondered there if perhaps a hybrid stack should be used
for example :-
RTP/UDP/IP & RTCP/TCP/IP.
Any comments or ideas about this ...

Thanking you, rgds,
Nikki