| Brand | Grandstream |
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| Product code | GHP620 |
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| Display | No LCD display (Grandstream series comparison) |
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| SIP accounts / lines | 2 SIP accounts, 2 lines |
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| Network | One auto-negotiation 10/100 Mbps ethernet port, integrated PoE Class 2 (GHP620 / GHP621) |
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| Wi-Fi — GHP620W / GHP621W only | Integrated dual-band 2.4GHz & 5GHz 802.11 a/b/g/n/ac (hardware versions 5.0 and earlier); hardware versions above 5.0 support dual-band Wi-Fi 6 |
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| Wi-Fi — GHP620 / GHP621 | No Wi-Fi |
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| PoE | Yes, integrated (GHP620 / GHP621) |
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| Power — W models | Universal power adapter, input 100–240Vac 50–60Hz, output 12V/0.5A (6W); also USB Type-C charger |
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| USB | USB Type-C port for charging external devices (500mA MAX) |
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| Feature keys | 26 keys, including 6 programmable keys, 12 standard phone digit keys (0-9, *, # — speed-dial configurable on web page) |
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| Feature keys (continued) | 5 function keys (Flash, Redial, Hands-free, Voice Mail, Hold), 3 volume control keys (Up/Down/Mute, with red colour LED) |
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| Speed-dial keys | 10 speed-dial keys |
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| Voice conferencing | 2 SIP accounts and lines, up to 3-way conference |
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| Voice codecs | Full-band Opus voice codec |
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| HD audio | HD speaker on the handset |
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| Voice quality | Advanced jitter-resilience algorithm that tolerates up to 30% packet loss without impacting voice quality |
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| Hearing aid compatibility | Yes (HAC) |
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| Device management | Yes, GDMS (online device management and provisioning) |
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| Faceplate | Faceplate included; sticks on the indicated area (per Quick Installation Guide) |
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| Colour | White (GHP620, GHP620W), Black (GHP621, GHP621W) |
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| Mounting | Desktop or wall-mounted |
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| Dimensions | 210mm (L) x 132mm (W) x 89.8mm (H), with handset and base stand |
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| Unit weight | 560g (GHP620 / GHP621), 610g (GHP620W / GHP621W US), 620g (GHP620W / GHP621W World) |
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| Package contents | GHP62X phone, handset, base stand, faceplate, phone cord, Quick Installation Guide, 12V power adapter (GHP620W and GHP621W) |
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| Warranty | Manufacturer warranty |
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