- 24FXS- 24FXO- SIP/MGCP protocols- 500 routing and number manipulation rules- Fax over IP using T.38 & G.711 pass-through- Hot-swappable FXS/FXO interface card- Dual redundant gigabit Ethernet ports- Dual AC/DC power supplies available- PSTN failover- Auto provisioning- Remote access via the Redstone Cloud*- Management with Redstone or third-party Remote Device- Management Systems (TR-069, SNMP)- Interoperability with popular SIP servers, such as Cisco- CallManager/CUCM, Broadsoft, Microsoft Skype for Business- (Lync), and Asterisk/Elastix- Class I lightning protection