Yealink SIP ATA GW3CM is a Next-Generation IP Communication solution with complete functions and high performance-price ratio. It is a voice, fax, internet data and PSTN "all-in-1" integrated access device, enabling feature-rich telephone services and features over internet connection. Its elegant and fashionable design, high-level voice quality, 3 SIP accounts and platforms availability can bring customers unlimited convenience and content of IP communication. Key Features are showed as follows: PSTN+VoIP: Convenient to make/receive both VoIP and PSTN calls, the calls can be auto-detected and auto-switched. Interface: One FXS port, one PSTN lifeline port, dual 10/100 Mbps network ports(RJ45) with high performance NAT router. Auto-provision: Auto-provision can be easily done via TFTP, FTP and HTTP, ideal for central management. 3 SIP accounts: Easy to switch between 3 SIP user accounts. T.38 Fax over Internet: support fax over internet.