Specifications: Sip/h.323 Up to 4 GSM channels Standard sip and h.323 client embedded in one hardware unit Lcr according to free minutes and GSM providers H.323 to sip media converter for up to 10 VOIP channels Sip proxy - registrar for IP phones included Intelligent incoming call routing Disa with voice navigation, user defined voice message for incoming calls Top voice quality (efr super sound) Easy way from ethernet to internet over GPRS with dial on demand function SMS sending and receiving (web interface) Simple web based configuration CDR buffer for up to 500,000 records Log and statistics saving Integrated antenna splitter Worldwide use (all frequencies are supported)