... SLIC as well. The box supports SIP (IMS compatible) VoIP call protocol, and integrates 4*10/100Mbps and 2*POTS ... high integration, easy to build network, seamless interoperability with call agent, strong SIP expansion, high performance/price ratio, etc ... reverse polarity, CID, MD5 authentication, abbreviation dial, call forward, call waiting, hot-line call, alarm clock, and all kinds of value-added ...