IP/ethernet connection only, dial not supported. RPCT ONLY. The new Tetra Desk/3500 easy-to-use countertop device gives users the freedom to accept electronic card payments, with or without an interface with a cash register or POS system. All Desk/3500 functions, from payment processing and receipt printing to settlement reporting, operate from a single, secure device. This device accepts MSR, EMV, and NFC transactions; and is P2PE certified.