Subj : Re: voip -> ata -> 56k modem
To   : bbsing
From : Retroswim
Date : Sun Mar 02 2025 23:56:28

 bb> you are right about the speed less than 56k. I can't get them to
 bb> connect through the asterisk server over 33k.

56k dialup internet connections are asynchronous IIRC. Consumer modems can
only transmit at 33.6k/48k, the ISP modems had to have the (expensive) DSP
analogue domain noise/echo cancellation wizardry to be able to send you
56kbps.

I think that 48k figure is in magical unobtanium conditions too, the
attainable figure is by all accounts 33.6k.

I think Cathode Ray Dude did a video about it, having modems call each other
through an ATA. As long as you have a lossless codec, it should work just
fine as you've experienced!

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