Simcom has recently released a new 4G/LTE modem, and it has USB audio support.
You can find sim7100_usb_audio_application_note_v0.01.pdf   with
details at the vendor site, or at techship.com  after registration.

It transmits 8kHZ, 16-bit PCM audio via a USB UART simulation.

So, in theory, gsmopen module may be adapted to it (or maybe a new
module is worth starting).

I ordered a sample, will check it out soon.

cheers,
stanislav

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