Jurgen comments

[juberti]

While reading the document, I wrote down the following notes that the
editor may take into account when revising the document:

• in 3.1, expland SSRC on first usage and say that this is about
  sending streams over RTP somewhere early on (I assume this is
  implied by using the term WebRTC but for outsiders like me it may
  help to be more specific).

Acknowledged.

• stylistic: I am not a big fan of using citations like '[RFC2198]' as
  ordinary words or nouns, it makes text difficult to follow unless
  you know the RFC numbers by heart and your brain translates them
  back to something meaningful on the fly. This makes texts more
  difficult to read for outsiders. Example:

  This mechanism is similar to the
  [RFC2198] mechanism described above.

  I prefer this:

  This mechanism is similar to the
  redundant encoding mechanism described above.

  There are couple of such usages of [RFCXXXX] in the document

OK.

• add reference for PCMU

OK. Reminder to self, RFC 5391.