Basically, you want voice on LTE, confirmed in the specifications. Most
of these cards are still using 3G/umts for voice, even though they use
LTE for data. They are often used in laptops and tablets. Think
Sierra/Qualcomm, Huawei, uBlox etc. There's lots of them.

Francis

On 5/12/2016 10:11 PM, Oivvio Polite wrote:
> On mån, dec 05, 2016 at 09:46:08 +1000, Francis wrote:
>> One option is using mini-PCIe WAN cards that are VoLTE capable, using
>> the I2S bus for bidirectional digital audio. The sticking point with
>> this approach is that you need a backplain card with an I2S to USB
>> bridge in order to capture the audio. This would probably work best with
>> mod-gsmopen.
>>
>> I searched high and low for such a thing, and managed to find one
>> Russian firm that had a single slot device. The downside is that it is
>> horrendously expensive (about $400 euros from memory), considering it
>> only has about $5 worth of components on it. There are proprietary
>> backplains, but so are their connectors, which limits you to their own
>> line of daughter cards.
>>
>> Francis
>>
> Thanks!
>
> When we say that a card is VoLTE capable, what do we mean? Is VoLTE one
> or many different protocols? Or to put it another way: When I google
> these WAN cards what should I look for?
>
> Oivvio
>
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