[Freeswitch-users] SIMCOM LTE modems with USB Audio

[Stanislav Sinyagin]

probably the most flexible option would be a small standalone daemon
that links the SIMCOM modem audio with a virtual PortAudio device.
Then you can have this stream in FreeSWITCH or in any other software
that is able to communicate with PA.



On Wed, Apr 25, 2018 at 1:49 PM, Stanislav Sinyagin <ssinyagin at gmail.com> wrote:
> 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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