Grandstream Enterprise IP Phone with Gigabit Speed, Supports 8 Lines VoIP & 4 Function Keys

The GXP2135 is a High-End IP phone that supports 8 lines, 4 SIP accounts, Gigabit speeds and up to 32 virtual BLF/speed-dial keys - making it ideal for busy workers.PROTOCOLS/STANDARDS SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP, ICMP, DNS (A record, SRV, NAPTR), DHCP, PPPoE, TELNET, TFTP, NTP, STUN, SIMPLE, LLDP, LDAP, TR-069, 802.1x, TLS, SRTP, IPV6NETWORK INTERFACES Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports with integrated PoEGRAPHIC DISPLAY 2.8 inch (320x240) TFT color LCDBLUETOOTH Yes, integratedFEATURE KEYS 8 line keys with up to 4 SIP accounts, 4 XML programmable context-sensitive softkeys, 5 navigation/menu keys, 11 dedicated function keys for MESSAGE (with LED indicator), PHONEBOOK, TRANSFER, CONFERENCE, HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE, VOL+, VOLVOICE CODEC Support for G.729A/B, G.711µ/a-law, G.726, G.722(wide-band), in-band and out-of-band DTMF (in audio, RFC2833, SIP INFO)AUXILIARY PORTS RJ9 headset jack (allowing EHS with Plant