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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