["16-Port FXS Analog Telephone Adapter - Perfect for Businesses The Grandstream GXW4216 v2 offers a reliable solution for connecting analog telephones, fax machines or PBX systems with VoIP technology. Ideal for small and medium-sized businesses that need an efficient hybrid telephone system", "16 RJ11 FXS ports & 1 50-pin Telco connector", "Gigabit Ethernet (10/100/1000 Mbps) interface", "128x32 graphic LCD display with backlight", "Support for up to 4 SIP server profiles", "Secure encryption: TLS, SRTP, HTTPS, AES-128", "T.38 Fax over IP support", "Automatic deployment via TR-069, XML and HTTPS", "HD Audio with Opus and G.722", "3-way voice conference per port", "Flexible mounting: desktop & rack", "Grandstream GXW4216 v2 adapter", "Power supply", "Network cable", "Rack mounting kit", "Quick guide"]