1. Supporting GSM mobile network. 2. 2. Up to 4 SIM cards, 4 analogical ports and 4 LAN ports. 3. Switch call from GSM, PSTN and INTERNET. 4. Remoting user can free call anybody passing two routes between GSM ( or PSTN) and INTERNET in gateway(optional). 5. VOIP applying functions: it can support call keeping, telephonist transfer, call waiting, unread SMS hint, avoidance of disturbance, three party service, different operators, hotline, alarm and call forwarding when busy line, no answering of the call, no condition. 6. Incoming call display. 7. Billing support. 8. Pre-set area code, IP number, Special service number and any other head numbers. 9. Privilege setting for international distant and local call-in and call-out. 10. Function of locking the SIM/RUIM card, terminal, network and district. 11. Supporting connecting PBX for group users. 12. Indicator for signal, power and busy line function. 13. VOIP can support: AGS, G165, RFC2833, FSK dialling directly, G711 fax, TOS, NAT dialling directly.