- 48 Concurrent Calls - 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