The Grandstream GHP621 wired IP phone supports 2 SIP accounts and 2 lines, as well as calls over Ethernet. It features speakerphone, HD audio quality, and wideband audio support. It is powered via PoE and can be managed and configured online through GDMS.

It offers call transfer, redial, conference, and hold functions, as well as server-based voicemail. It features 6 programmable keys, 10 speed-dial keys, and a customizable front panel for displaying a logo. It supports desktop or wall mounting, multicast paging, and door opening via GDS.

• Color: Black
• Type: Wired IP phone
• SIP accounts: 2
• SIP lines: 2
• Connectivity: Ethernet
• Network port: 10/100 Mbps with auto-negotiation
• Power supply: PoE Class 2
• Display: None
• Audio quality: HD
• Handset: HD, with wideband audio support
• Speakerphone: Yes
• Keys: 6 programmable keys and 12 dialing keys
• Function keys: Flash, redial, speakerphone, voicemail, and hold
• Volume keys: Up, down, and mute with a red LED indicator
• Call features: Dial, answer, transfer, conference, redial, Flash, hold, and mute
• Conference: 3-way
• Other features: Flexible dial plan, server redundancy and failover, call out, multicast paging, and emergency calling
• Jitter resilience algorithm: Tolerates packet loss of up to 30% without affecting voice quality
• Door opening: Via GDS
• Compatibility: Hearing aid compatible (HAC)
• Security: Secure boot, dual firmware images, and encrypted data storage
• Mounting: Desktop or wall-mounted
• Customizable front panel: Interchangeable front panel for displaying a logo
• Operating temperature: 0 °C to 40 °C
• Storage temperature: -10 °C to 60 °C
• Operating humidity: 10% to 90%, non-condensing
• Package contents: Handset with cable, phone stand, and quick installation guide