Credit Card machines do work through ATAs and VG224s. The machines sometimes only run at a fixed modem speed and refuse to downspeed (I've only seen modems across VoIP go to about 28.8 Kb/s) So if they're hard-coded to run at, say, V90 or even V92, then you're stuffed. When they do downspeed, they're not always great at it. In my experience, embedded modems are generally rather poor quality. If you can force the speed (19.2Kb/s is usually a good speed) then that can help.
Putting fax & modems across SIP tunks over the Internet adds even more complexity to the mix.
Also, I've come across a lot of credit card companys who refuse to support machines running across VoIP phone systems. Either they claim they don't work or that they are less secure than traditional phone systems. In the extreme, they'll cut off service until you put the machine on a traditional PSTN analogue line.
Thanks for that response Gordon, might check on that. This is what I tried so far but not much joy.
1. Disable noise generation
2. Disable VAD
3. Set codet to G711 a-law (outside of US)
I got those settings suggestion from a basic deployment guide of credit card machine.
It did mention about reducing the speed as you mentioned, namely set the baud rate to 9.6Kbps and to disable ECM in the Terminal POS. Will try contact the bank support and see if they can help set that or send their technician to set it.
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