[Asterisk-Users] About Voip Technology : RTP over TCP

[Atul Thosar]

hello All

I am reading information about VoIP technology
For that i am concentrating on SIP (Session Initiation Protocol) and 
RTP (Real Time Transport Protocol).

I am interested in implementing RTP over TCP
I found that there are some disadvantages of TCP, some are

1) TCP doesn't support multicasting.

2) Through TCP is reliable, it heavily depends on retransmission of     
   lost or corrupted packets. That increases Delay. Our aim is real     
   time delivery of packets not reliability. 

3) TCP congestion control mechanism decreases the congestion window    
   when packet losses are detected.

Apart from these flaws i am interested in implementing RTP over TCP

Is it possible ? 
What is feasibility of implementing RTP over TCP ?

One more point is What is feasibility of implementing RTP over TCP in 
case of NAT (Network Address Translation) is there ?

Need your valuable suggestion.

Thank You !

Atul Thosar