NT-ET128828-CDMA is a CDMA to Analog Converter, the device can produce a FXS line to allow a regular phone to be connected and used just like a local landline (PSTN) except your calls will go out from the CDMA network. This device can both receive and make calls.
NT-ET128818-GSM is a Fixed Wireless Terminal designed to provide better wireless connectivity between POTS (plain old telephone set) and existing GSM 900/1800Mhz network with high sensitivity to receive signal and large transmitting power to expand extensively the effective coverage of GSM service. It can be used not only in communication for vehicles such as automobiles, trains, floating vehicles, etc., but also in communication for construction sites, isolated islands and rural areas where hardwire-line telephone service is unavailable. So they are widely used in home &office, public phone, rural areas, steamer, railway etc.
