Hi Mychaela,
On Mon, May 29, 2017 at 12:21:38PM -0800, Mychaela Falconia wrote:
On 5/29/17, Harald Welte <laforge(a)gnumonks.org>
wrote:
d) some modems expose voice as "GSM codec
frames over UART"
You got me curious here: are there any modems out there other than
FreeCalypso that offer the quoted special feature? Someone actually
paid me to add this special feature to FreeCalypso a little over a
year ago, so I reason that it must be sufficiently non-standard that
they couldn't find a commercial off-the-shelf modem that can do this
feat.
I've definitely seen this in commercial modems.
If I remember correctly, it was the Gemalto EHS-6, which can disable the
GPS uart and re-cycle that UART for the audio frames. It might also
have been a Quectel UC-20. Now that I think more about it, I think it
was the UC-20.
--
- Harald Welte <laforge(a)gnumonks.org>
http://laforge.gnumonks.org/
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