Hi Sarah,

there's no really good option for this right now (especially at higher 
speeds), but supersat wrote this yate module to run an old "Winmodem" 
driver binary (sl-modem) from a PBX.
[...]
https://github.com/Shadytel/shadysoftmodem

I looked at the source tree at that link, and - please correct me if I
got it wrong - it seems to me that it uses some binary-only *.o code
pieces, i.e., blobs.  If this solution is indeed blobware, then it is
very UNattractive...

However, prior to your reply, Christoph Lauter pointed me to spandsp -
seeing that name in Chris' response jogged my memory, I now recall
someone else (perhaps it was you?) mentioning spandsp to me earlier,
in some OsmoDevCall or RetroNetCall chat.

I cloned spandsp from github and started looking at it.  At first
glance the code looks very complete, and appears to have all of the
pieces I am looking for.  However, the giant red flag I see there is
almost complete absence of documentation.  Sure, there are some
sprinkled doxygen comments, but no REAL documentation.  I wonder if
perhaps Steve U (the author of spandsp) follows a business model where
the code is released under GPL, but instead of proper documentation
that would allow anyone to self-support, he offers paid support to
those who need it badly enough...

When I have more time (always the big uncertainty), I will try digging
through that spandsp code a bit harder, with a goal of figuring out
how to exercise V.21 modem functions for a start, and try building a
SIP+RTP 300 baud modem on top of the lib - and I may also try emailing
Steve U and asking him about his support offerings...

M~
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