... , Ready, Status, WAN, PC, GSMCall forward from GSM to VoIP and VoIP to GSMDial in mode or dial out mode onlyDial PlanPassword ... GSM dial in or dial outRetransmit GSM Caller ID to VoIP terminalEnhanced FeaturesDynamic selection of codecAdvanced jitter bufferAutomatic traversal of NAT ... the telephone, and you are want to get preferential from VoIP Phone anytime and anywhere.You just call the SIM card ...