I was writing my term paper on the AIX2 protocol and noticed that in Figure 1 of http://www.ietf.org/internet-drafts/draft-guy-iax-02.txt on page 16, the first step is a REGAUTH:
However, it seems like the first step should actually be REGREQ as stated in the text
[quote] Registration, illustrated in Figure 1, is performed by a registrant
that sends a username and a registration ‘refresh’ period to the
registrar. This is accomplished with a REGREQ message.[/quote]
Is this the case? My packet tracer seems to also indicate that the first frame sent is a REGREQ.