Four (4) PSTN Line FXO Ports. Two (2) Analog Telephone FXS Ports, both with lifeline capability. Up to 45 Concurrent Calls. Up to 3 conference bridges, up to 25 simultaneous PSTN or IP participants. Dual 10M/100M/1000M RJ45 Ethernet ports with integrated PoE Plus (IEEE 802.3at-2009). USB and SD Peripheral Ports. Layer 3 QoS.