Additional Details ------------------------------ Product description: 48 telephone FXS ports with both RJ11 and 50-pin Telco connectors, as well as per port LED Gigabit Ethernet and a backlit 128x32 graphic display with support for multiple languages 2/3/4 SIP Server profiles per system and independent SIP account per port Supported voice/Fax codecs include G.711, G.723.1, G.726A/B, iLBC, T.38 Fax Advanced carrier grade 128ms-tail-length G.168 line echo cancellation Over-voltage and over-current protection(ITU-T, K.21) Support VMWI, NEON LED and stutter tone for message waiting indication Automated provisioning using TR-069 or AES encrypted XML configuration file; TLS/SRTP/HTTPS for advanced security and privacy protection