Implement RFC 8489 - Githubissues

Here is a list of changes since RFC5389 which need to be implemented:

[ ] Added support for DTLS-over-UDP RFC6347.
[ ] Made clear that the RTO is considered stale if there are no transactions with the server.
[ ] Aligned the RTO calculation with RFC6298.
[ ] Updated the ciphersuites for TLS.
[ ] Added support for STUN URI RFC7064.
[ ] Added support for SHA256 message integrity.
[ ] Updated the Preparation, Enforcement, and Comparison of Internationalized Strings (PRECIS) support to RFC8265.
[ ] Added protocol and registry to choose the password encryption algorithm.
[ ] Added support for anonymous username.
[ ] Added protocol and registry for preventing bid-down attacks.
[ ] Specified that sharing a NONCE is no longer permitted.
[ ] Added the possibility of using a domain name in the alternate server mechanism.

pion / stun