Depending on your VSP, fax over G711 (it just wont work over compressing codecs like g729) will work in my experience between 98% and 0% ( I get 98% from Vitelity, mostly a lot less than that with other carriers ) If you have a T38 path and T38 pass-though is enabled in asterisk, between your ATA fxs port (your fax machine) and the PSTN (the other fax machine), which needs compliance of both your ATA and your VSP again, then it should be about as good as "good old fax machines", again about 98%. As to logging, there is little available for analog faxes, If you care to install iaxmodems and/or t38modems and hylafax then there is a lot more logging availabale. (I do and IWFM)
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