Help understanding TURN with TCP

[jiten shah]

Hello. I am playing with TURN and WebRTC. I was trying the following combination :

'url': 'turn:1.1.1.1:3478?transport=tcp' and I used the CoTurn server with following parameters :

./turnserver -a  -v -X 1.1.1.1 --no-udp -u gorst:hero  -r abc.com --no-stun 

I was just trying TURN with TCP.

So when the Allocate Request is send why is the REQUESTED-TRANSPORT : UDP ?

Is it because Chrome only supports UDP for relaying the data to the peer ?But then I asked my friend on other end to monitor the logs - he saw TCP packets 

and I too saw TCP Packets.

Was confused why did UDP come into picture. The data was relayed on TURN server from one TCP port to other TCP port right ?