16 FXS port, the GXW4248 has two 50-pin Telco ports 1 Gigabit network connection 132x48 graphic display with backlight and multilingual menu navigation 4 SIP server profiles per system, independent SIP account per port With SIP platforms, IP telephone systems and SIP soft switch -Platforms from leading providers tested for compatibility and interoperability. Extensive security functions through SRTP/TLS/HTTPS