The Grandstream GXP-1620 wired IP phone supports two SIP accounts and features HD audio technology. Its monochrome graphic LCD has a resolution of 132 × 48 pixels and a backlight. Features include caller ID, speakerphone, and three-way conferencing.

It also supports XML, call parking and pickup, BLF, call forwarding and transfer, as well as the G.722, G.711(A/μ), G.723, G.726-32, G.729 A/B, and iLBC codecs. The two RJ45 Ethernet ports support speeds of 10/100 Mbps, and there are RJ9 ports for the handset and headset. The stand has two adjustable angles, and the device can be wall-mounted.

• Type: Wired IP phone
• Color: Black
• SIP lines: 2
• Display: Monochrome graphic LCD, 132 × 48 pixels
• Display backlight: Yes
• Phonebook capacity: 1000
• Line keys: 2
• Memory keys: 2
• Features: Caller ID, speakerphone, XML, call parking, call pickup, BLF, call forwarding, call transfer, three-way conferencing
• Audio: HD audio, full-duplex speakerphone
• Wideband codec: G.722
• Narrowband codecs: G.711(A/μ), G.723, G.726-32, G.729 A/B, iLBC
• Ethernet ports: 2 × RJ45 10/100 Mbps
• RJ9 ports: For handset and headset
• Wall mounting: Supported
• Stand: 2 adjustable angles
• Power supply: Input 100–240 V AC, 50–60 Hz; output 5 V DC, 600 mA