[Iaxclient-devel] More tracing and info on IAX2 bug...

[Steven S. <ss...@so...>]

I made a small change to the code in iax_header_to_event, essentially
telling the function to accept NEW and HANGUP commands out of sequence.
It worked -- sort of.  It ALWAYS detects and raises the RING event.
Unfortunately, it seems to bollix up the audio stream after a while. The
first few calls go through just fine.  By the 3rd or 4th call, however,
audio never connects and we get a stream of VNAK messages.  Here's my
trace:

16480234 Log Message-> I. Sequence: 0, O. Sequence: 0, Type: 6,
Subclass: 1
16480265 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16480281 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16482515 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16482562 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 2,
Subclass: 2
16482640 Log Message-> I. Sequence: 2, O. Sequence: 2, Type: 6,
Subclass: 4
16485656 Log Message-> I. Sequence: 2, O. Sequence: 2, Type: 6,
Subclass: 4

16501390 Log Message-> I. Sequence: 0, O. Sequence: 0, Type: 6,
Subclass: 1
16501406 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16501421 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16503609 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16503656 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 2,
Subclass: 2
16503687 Log Message-> I. Sequence: 2, O. Sequence: 2, Type: 6,
Subclass: 4
16508328 Log Message-> I. Sequence: 2, O. Sequence: 2, Type: 6,
Subclass: 4

16520843 Log Message-> I. Sequence: 0, O. Sequence: 0, Type: 6,
Subclass: 1
16520875 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16520890 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16522640 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 4
16522703 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 2,
Subclass: 2
16522734 Log Message-> I. Sequence: 2, O. Sequence: 2, Type: 6,
Subclass: 4
16527359 Log Message-> I. Sequence: 2, O. Sequence: 2, Type: 6,
Subclass: 5

16532921 Log Message-> I. Sequence: 0, O. Sequence: 0, Type: 6,
Subclass: 14
16532937 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 15
16532953 Log Message-> I. Sequence: 0, O. Sequence: 0, Type: 6,
Subclass: 14
16533078 Log Message-> I. Sequence: 1, O. Sequence: 1, Type: 6,
Subclass: 15
16533078 Log Message-> I. Sequence: 2, O. Sequence: 1, Type: 6,
Subclass: 4

16556625 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 1
16556640 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16556640 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16556687 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16556703 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16556953 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16556953 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16557906 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16557921 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16558625 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 1
16559906 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16559968 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16560000 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
16560015 Log Message-> I. Sequence: 2, O. Sequence: 0, Type: 6,
Subclass: 18
... (4 pages of this)...

FYI: Subclass Key

1 = IAX_COMMAND_NEW
2 = IAX_COMMAND_PING
4 = IAX_COMMAND_ACK
5 = IAX_COMMAND_HANGUP
14 = IAX_COMMAND_REGAUTH
15 = IAX_COMMAND_REGACK
18 = IAX_COMMAND_VNAK	/* If we receive voice before valid first voice
frame, send this */