[Freeswitch-users] SIMCOM LTE modems with USB Audio

[Stanislav Sinyagin]

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 at 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 at 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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>
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>
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