AudioCodes M500L, Black, Browser-based GUI, CLI, SNMP, INI Configuration file, REST API, EMS, SIP, IEEE 802.1Q, IEEE 802.1p, HTTPS, SRTP, SSH, TLS, 1-4 BRI ports, network S/T interfaces, NT or TE termination, Up to 4 FXS and 4 FXO ports AudioCodes M500L. Product color: Black. Management protocols: Browser-based GUI, CLI, SNMP, INI Configuration file, REST API, EMS, Supported protocols: SIP. Networking standards: IEEE 802.1Q, IEEE 802.1p. Security algorithms: HTTPS, SRTP, SSH, TLS. Interface: 1-4 BRI ports, network S/T interfaces, NT or TE termination, Up to 4 FXS and 4 FXO ports