... synchronous/asynchronous interface cards, ADSL2+/G.SHDSL interface cards, FXS/FXO voice cards, ISDN interface cards, CPOS interface cards and ... and remote loopback functions for test and troubleshooting. FXS/FXO voice cardSIC cardSupports access and processing of AT0 loop ... FR QoSVoiceRTP, SIP, SIP AG, IP PBX/TDM PBX, FXO/FXS, VoIP/conference callSecurityACL, firewall, 802.1x authentication, MAC address ...