Wireshark-bugs: [Wireshark-bugs] [Bug 6483] Support for reading trace files from Aethra ISDN/etc
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6483
--- Comment #31 from Guy Harris <guy@xxxxxxxxxxxx> 2011-11-04 16:21:40 PDT ---
For the "Buffer overflow due to serial port connection too slow.aps" trace:
1) Do you have the Aethra dissection of all the packets past packet 50?
There are some packets, such as packets 158 and 160, that are different from
the packets shown in the Aethra dissection screenshot. That might require
additional screenshots.
2) What are the .apc, .apd, and .apt files corresponding to that .aps file?
Wireshark currently can't play it back because it has no support for
voice-over-ISDN; that would have to be added. I'm guessing that the B channel
"Transparent data" packets (other than the "Constant Value" ones) consist of
1600 voice-channel samples, presumably a-law encoded, rather than μ-law
encoded, as it appears this is from the UK.
H channels:
I.431 says:
4.4.2 B-channel and H-channels
A channel occupies an integer number of time slots and the same time slot
positions in every frame. A B-channel may be assigned any time slot in the
frame, an H0-channel may be assigned any six slots in the frame, in numerical
order (not necessarily consecutive), and an H11-channel may be assigned slots 1
to 24 in a frame. The assignment may vary on a call by call basis (see Note).
Mechanisms for the assignment of these slots for a call are specified in
Recommendation I.451.
NOTE – For an interim period, a fixed time slot allocation to form channels
may be required. An example of a fixed assignment of slots for the case where
only H0-channels are present at the interface is given in Annex A.
so that's what I'm referring to.
It sounds as if you have no "data" calls, e.g. PPP over a B or H channel, so I
wouldn't be able to determine how those are represented in the capture file
(does it just give a raw bit stream, or does it extract, for example, PPP
frames from the HDLC-like framing that would presumably be used?).
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