La description

Voice & Fax
G.**1a-law 、G.**1u-law 、G.**9a、GSM-FR、G.**3.1
DTMF：RFC***3, SIP INFO, INBAND,RFC***3
FAX over IP：T.*8, Pass-Through
Bits per second:*4.4kbps
Auto Call Distribution: when busy tone, auto distribute call to a free port
Speech processing engine function:1.Max support **6ms auto echo canceler
                  2.Automatic Gain Control
                  3.Silence Suppression & Detection
                  4.Comfort Noise Generation
                  5.Echo Cancellation
                  6.Voice Encryption
LED Indicators: Power, Run , WAN and LAN LEDs
FXS Interfaces:
Number of interfaces:*6/*0/*4/*8/*2*FXS RJ**1
Transmission distance:1km
Billing methods :support the antipodal signal billing
Resistance: default support CHINA.CHINA（HK).AMERICAN standard,can choose different national standard according to the need.
Maintain & Upgrade
Web based configuration
Telnet configuration
Support English and China language
Firmware upgrade by TFTP/Web