These binary traces are enabled in the Foip configuration tool, section Advanced, configuration option BtrTraceLevel. Enable binary traces in the Foip configuration and check these traces with the BTRC.exe tool.which transmission speed was used, which FAX pages were confirmed positively and which not, if there had been retransmissions.) the Wireshark trace for FAX Passthrough mode just shows audio stream of the FAX communication as RTP (Real time Transport protocol) data and some more steps are necessary to get out more detailed information about the FAX protocol itself.īeside the method described in this article there are also some other methods for analyzing: In difference to the T.38 FAX protocol, where the Wireshark function Telephony - Voip calls with the button Flow sequence gives a good overview about the FAX communication protocol (e.g.
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