- Max. FXS/FXO ports: 48- Max. concurrent calls: 48- SIP/MGCP protocols- 500 routing and number manipulation rules- Fax over IP using T.38 & G.711 pass-through- Dual redundant Ethernet ports- Dual DC/AC power supplies available- PSTN failover- TLS/SRTP- Auto provisioning- Remote access via the Redstone Cloud*- Management with the 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