... Support transparent data transfer 4. Support DDNS IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, Support transparent data ... and one pulse input counters.Support multi data centers and it can support 5 data centers at the same ... online trigger ways, including SMS, ring and data. Support link disconnection when timeoutSupport dynamic domain name(DDNS) ...