PSA: How to reduce the overhead of webrtc?

[李欣]

hi all:

      I send P2P data by datachannel. I find the datachannel has a high overhead. When a DTLS packet is 1367 bytes. the overhead of 

SCTP + DTLS + UDP + IP

and that is:

28 bytes + 20~40bytes + 8 bytes + 20 ~ 40 bytes

the overhead would be rougly about 120 bytes. How to reduce the overhead ?

Thank you.