- Automatic malfunction checking. Keep its working conditions under hot-pull and hot-push of each board / card.

- PCM BUS switching, digital configuration

- Trunk connections of loop, 2B+D (U or S/T), E&M, Carrier etc

- Functions: caller ID displaying, conference call, group calling, one button calling, digital recording and broadcasting, videophone, CCTV monitor and control system

- Utility system of PC management, billing, backup checking etc

- Three layers security protections: anti lightning strike, anti high voltage,       anti high power electric interfere

- Signaling of No.1, No.7, R2, ISDN, support 110 and 119 alarming system (China only)