We have done a few customers EFTPOS over VFX through SPA2102's, most work fine but I struck one that was a brand new terminal that simply refused to work.
I would love to hear success stories and nightmares, tricks and traps!
While EFTPOS does work in a VoIP environment if you are encountering issues the simplest solution to get around the problem is to just move to an IP based terminal. Most vendors now have them.
We had an AC Neilson Home Scan terminal where you scan the bar codes of all your shopping and the terminal regularly uploads the data to their server. It does not work over VFX at all, but being an electronic engineer I've tried various things. In the end I got it working perfectly by simply connecting an ADSL line filter between the terminal and the VFX router. My theory as to why it worked is that the modem assumes you are connected to a normal phone line and thus expects the signal to already be bandwidth limited. But the router does not provide you with that and also assumes the signal you put into it will be bandwidth limited. Then when the ADC and DAC (analogue to digital and digital to analogue converter) samples the signal you get image frequencies etc. Long story, but basically you need to sample fast enough to capture the highest frequency in your signal or else low frequencies will appear where there were none (Nyquist sampling criteria).
An ADSL line filter is a simple way of limiting the bandwidth, easy to try, and might just work for you. Wiring is easier when you realise that the "line" plug and the "modem" socked is electrically the same and the filter works in either direction, so you can plug on device into the "modem" socket and the other device into the "phone" socket and leave the "line" plug unconnected. Please try it and let us know if it works for you.
You can never have enough Volvos!
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