Specify FEC codec names

[ibc]

In RtpSender.send():

if withParameters.codecs[j].name is equal to "red", "cn", "dtmf", "rtx" or a forward error correction codec, return a promise rejected with InvalidParameters.

May the spec specify the exact "forward error correction codec" names? AFAIK they can be "fec" and "ulpfec", right? If so, please make the spec specify them.

[aboba]

I think the MIME subtypes are "ulpfec" (from https://tools.ietf.org/html/rfc5109#page-31) and "flexfec" from https://tools.ietf.org/html/draft-ietf-payload-flexible-fec-scheme-02#page-17

[ibc]

Yep, I've realized of that right now :)

However I propose that the spec becomes much clearer when it comes to IANA names.