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Teardown of Possio Greta cellular GSM fax machine (osmocom.org)

submitted 5 months ago by [email protected] to c/[email protected]

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Not sure if this is useful to off-gridders but I guess if you are in an area with voice towers that do not offer data, this could be useful.

I wonder if a software fax app on a GSM phone would be able to send faxes without needing data service. Or in fact, might it have to? Otherwise I guess if it were to use mobile data it would have to run over VOIP, perhaps with sketchier results.

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[–] [email protected] 4 points 5 months ago (1 children)

I suspect you might run into issues with the voice data-compression used by modern cellular networks.

[–] [email protected] 2 points 5 months ago* (last edited 5 months ago)

If that’s a lossy compression, then yeah that would surely blow the fax over voice GSM option. Although in principle a well-designed system would detect the fax/modem handshake and disable compression.

(edit) so are you saying CSD has been scrapped? Because IIUC CSD makes specific accommodations for data over voice.