Hi Mychaela, On Mon, May 29, 2017 at 12:21:38PM -0800, Mychaela Falconia wrote: > On 5/29/17, Harald Welte <[email protected]> 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 <[email protected]> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
