... ports for the LAN and an additional deviceGuad band GSM module: support GSM 850MHz, 900 MHz, 1800 MHz, 1900MHzSpeech ... , Status, WAN, PC, GSM Call forward from GSM to VoIP and VoIP to GSM Dial in mode or dial ... Plan Password protection for both GSM dial in or dial out Retransmit GSM Caller ID to VoIP terminal ... /B, G.723.1 DTMF: RFC 2833, In-band DTMF, SIP INFO Web-base Management PPP over Ethernet ...