... voice call, fax, internet functions 3.max downlink: 3.1Mbps 4.RJ-11 interface 5.PABX 450Mhz CDMA wireless terminal ... transmission with maximum rate 3.1Mbps3,Reversed charge signal and pulse charge signal 12KC/16KC4,CID(Caller Identification)5, ... Indoor/Outdoor antenna optional8,Battery backup9,Support emergency call, call transfer, call forwarding, call waiting, call on hold,Three-Way Calling, etc.10, ...