I believe you can do this with just about ANY credit card processor as long as you have the software. I've seen Merchant Warehouse provide software that you can install on your P.C. and all you need is an internet connection.
Basically, the only method I can understand is that you'd setup the software to link to your bank account. Then whenever someone calls, you'd use the software, input the credit/debit card information or check information or whatever into the software. Then just process it.
That's the best I can tell you. Maybe contacting of these companies via telephone will result in better results. Do keep me posted though as I'm interested myself.
Paying $1.00 for 5 Minutes of Your Time, International Friendly, Payment by PayPal. Send Me a PM Now...