Dial up payment terminals transmit card data and obtain payment authorisation through a dedicated dial up telephone line, operating over PSTN or an ISDN Internet dial up service. Most of the older models of dial up terminals have internal modems that were designed for slower speeds, so they can’t handle the higher speeds digital phone lines offer. Use of the analogue phone line ensures a cheap and reliable static service, ideal for counter top payments where permanent connection to a phone line can be achieved. Dial up terminals can be easily integrated into existing Point of sale systems and provide a dependable back-up in case of mobile network problems.
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