Fax over G.711

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There is a software called spandsp which can process an audio recording of a fax session offline the way you want. But you can export the G.711 from the RTP stream into an audio file and then use spandsp's fax_decode to show you the T.30 events and create the image file. On Windows, I'm running it under cygwin.

Can you explain me how can I run this program in cygwin. I am a total noob in programing.

Unfortunately I cannot because a colleague who has already left the company has compiled it for me years ago, and since then the cygwin has evolved so is quite likely that the same binary will not run on a new installation of cygwin. So I can send you the binary if you give me your e-mail (you can post it here in some robot-unreadable form and remove the comment once you get an e-mail from me), but whether it will run in your newly installed environment is not guaranteed.

We already have the spandsp as optional library on board, for the handling of ADPCM streams. But again, it's an output pipeline, working on tap data, and not part of the dissection engine.

@Guillaume, I have sent you an e-mail with a link and erased your comment with the e-mail address, have you received the e-mail or not?