Grandstream grp2615, 5 sip, 10 lines, poe, wi-fi, black // hd audio, handset and speakerphone with support for wide-band audio 10 line keys with up to 5 sip accounts 40 built-in digital blf keys available extension module offers 40 blf/speed dial keys per module enterprise-level protection including secure boot, dual firmware images, and encrypted data storage integrated dual-band wi-fi 802.11 a/b/g/n/ac (2.4ghz 5ghz) dual switched auto-sensing 10/100/1000 mbps gigabit ethernet ports with integrated poe swappable face plates to allow for easy logo customization integrated bluetooth