<div dir="auto">Yes, it's clearly written in their documentation, that raw PCM is sent in an USB UART device.<div dir="auto"><br></div><div dir="auto">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.</div><div dir="auto"><br></div><div dir="auto">So, it only needs a budget for development. </div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Apr 24, 2018, 22:01 Tom Hartnett <<a href="mailto:hartnett.tom@gmail.com">hartnett.tom@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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.<div><br></div><div>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.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 24, 2018 at 3:28 PM, Stanislav Sinyagin <span dir="ltr"><<a href="mailto:ssinyagin@gmail.com" target="_blank" rel="noreferrer">ssinyagin@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">hi,<br>
<br>
I wrote about a year ago about SIMCOM SIM7100 series LTE modems and<br>
that they support USB audio. Now the vendor offers also SIM7500 and<br>
SIM7600 modems, also with USB audio, and in addition these newer<br>
models support 16-bit audio streams.<br>
<br>
Unfortunately I didn't find the free time to make a FreeSWITCH module<br>
for them, but if someone wants to sponsor such a development, or<br>
actually develop it, I'll be glad to work together.<br>
<br>
I've got a SIM7100E modem, and SIM7500E is ordered and is on the way.<br>
<br>
The SIM7500 series is cheaper, but it only supports 10Mbps downstream<br>
for mobile data. The SIM7600 supports up to 150Mbps. But for voice<br>
applications, data transfer rate should be irrelevant in any way.<br>
<br>
<br>
cheers,<br>
stanislav<br>
<br>
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