Grandstream Networks GXP-2140. Product type: IP Phone. Product colour: Black. Handset type: Wired handset. Lines quantity: 4 lines. Phonebook capacity: 2000 entries. Display: TFT. Display resolution: 480 x 272 pixels. Voice codecs: G.711a. G.722. G.726. G.729A. G.729B. iLBC. Ethernet LAN interface type: Gigabit Ethernet. Bluetooth version: 2.1+EDR. Supported network protocols: SIP RFC3261. TCP/IP/UDP. RTP/RTCP. HTTP/HTTPS. ARP. ICMP. DNS (A record. SRV. NAPTR). DHCP....