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