I was recently looking for an SPA112 for reasonable price and during my searches came across the Grandstream HT812 adapter in link below:
I managed to get a reasonably priced SPA112 from eBay and am now happy with it but the Grandstream device looks very similar port wise and is very reasonably priced compared to SPA. has anyone purchased one of these? and does it work as well as SPA? It would be interesting to know any info from users of this device.