Yes, it's clearly written in their documentation, that raw PCM is sent in an USB UART device. Mod_gsmopen is too imperfect, to say politely. It's easier to create a new module for UART audio than trying to adapt gsmopen for new modems. So, it only needs a budget for development. On Tue, Apr 24, 2018, 22:01 Tom Hartnett <hartnett.tom@gmail.com> wrote:
Funny you mention the Simcom as I'm testing the 7600AH now (unrelated to Freeswitch). The modems are odd in that they don't create a USB audio endpoint in the traditional sense. You have to move the PCM voice over their UART interface. That requires a little extra work as I haven't really found a good driver to manage that.
I'm really interested in these because I want to support VoLTE on AT&T. We haven't got that running yet, and my AT&T contact says there was an issue with provisioning this model in their database. Hopefully that will be fixed later this week.
On Tue, Apr 24, 2018 at 3:28 PM, Stanislav Sinyagin <ssinyagin@gmail.com> wrote:
hi,
I wrote about a year ago about SIMCOM SIM7100 series LTE modems and that they support USB audio. Now the vendor offers also SIM7500 and SIM7600 modems, also with USB audio, and in addition these newer models support 16-bit audio streams.
Unfortunately I didn't find the free time to make a FreeSWITCH module for them, but if someone wants to sponsor such a development, or actually develop it, I'll be glad to work together.
I've got a SIM7100E modem, and SIM7500E is ordered and is on the way.
The SIM7500 series is cheaper, but it only supports 10Mbps downstream for mobile data. The SIM7600 supports up to 150Mbps. But for voice applications, data transfer rate should be irrelevant in any way.
cheers, stanislav
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