... Range: GSM 850/900/1800/1900MHz •DTMF mode: Signal/RFC2833 •SMS/SMSC/USSD •Provide API interface •Call duration limitation •One/two ... •Manage Interface: 1 Console RFC2833 •Static IP, PPPoE, DHCP •Network Protocol Support: •IP,TCP, UDP,TFTP, FTP, RTP, RTCP, ARP,RARP ...