On 10/07/2011 04:04 PM, Kevin P. Fleming wrote:
First, we can see that Gafachi's T.38 implementation still has some
breakage in it (although the problems are ones that Asterisk has been
taught to deal with). In its 200 OK to the T.38 re-INVITE, it has
"a=T38FaxRateManagement:transferredTCFlocalTCF"; this is not valid (the
valid values for this are 'transferredTCF' and 'localTCF'). In addition,
even though Asterisk sent "a=T38FaxUdpEC:t38UDPRedundancy", Gafachi
replied with "a=T38FaxUdpEC:t38UDPFEC". For T.38 version 0 (which is in
use here), the only valid response was either what Asterisk sent, or no
T38FaxUdpEC value at all.
However, it is unlikely those are causing the call failure here. It's
hard to say for sure without seeing the contents of the UDPTL packets,
but based on their sizes, they are very likely "t38-nosignal" packets,
and if that's all the FAX stack in Asterisk ever received, it would not
trigger a FAX transaction to begin. Another possible problem is the
repeated 'seq 0' in all the UDPTL packets, but this could be a problem
with the UDPTL stack debugging messages themselves (this was just fixed
in the Subversion branches for Asterisk 1.8 and later a couple of days
ago).
Theres a few t30-nosignal packets at the beginning, but then they
transition to other t30 packets, including CNG, CED, preambles, training
and data. Wireshark says the sequence number is always 0, so it appears
that Asterisk is not mis-displaying
http://pastebin.ca/2087784
I can provide the raw tcpdump file if needed.
If you would, please retry this with the HEAD of the Asterisk 10 branch
instead of 10.0.0-beta1, and also capture the UDPTL packets themselves
so we can see what they contained.
--
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