Grandstream GHP621, Black Compact Hotel IP Phones, 2 lines, 2 SIP accounts, One 10/100 Mbsps Ethernet ports,USB Type-C port for charging external devices, PoE, No PSU included

Protocols/standards
SIP: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, RTCP-XR, TLS, SRTP
Network: IPv4, IPv6, HTTP/HTTPS, ARP, ICMP, DNS (A-record, SRV, NAPTR), DHCP, SSH, TFTP, NTP, STUN,
LLDP, TR-069, 802.1x

Network interfaces
One 10/100 Mbps Ethernet connector with auto-negotiation function and integrated Class 2 PoE module (GHP620/GHP621)

Wi-Fi
Built-in dual-band 802.11a/b/g/n/ac Wi-Fi module (2.4 and 5 GHz) (GHP620W/GHP621W models)

Main buttons
26 keys, including: 6 programmable keys; 12 standard numeric keys (0-9: speed dial keys, configurable on the website, *, #); 5 special keys (Flash, redial, speakerphone, answering machine, hold); 3 volume control keys: increase, decrease, mute (with red LED
indicator)

HD Audio One HD tube with broadband audio
Audio conferencing 2 SIP accounts and 2 lines, conferences for up to 3 participants

Voice codecs and features
Supports G.729A/B, G.711m/a-law, G.726, G.722 (broadband), G.723, iLBC,
full-band Opus, in-band and out-of-band DTMF (in audio, RFC2833, SIP INFO),
VAD, AEC, CNG, PLC, AGC, AJB

Telephony functions
Dial, answer, redial, reset, speakerphone, voicemail (with server), translation,
conference, hold/de-hold, microphone mute and on,
flexible configuration of subscriber groups, switching to a backup server in
case of failure during speed dial

Additional features
Support for multicast paging and E911 service
Door opening support via GDS
Support for advanced jitter resistance algorithm
USB Type-C connector for charging external devices (max. 500 mA)

Wall mounting
One wall mount

Quality of service
Layer 2 (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS)

Safety
Secure boot, random default password, unique security certificate
for each device, passwords for administrators, 256-bit configuration file
AES encryption, SRTP, TLS, access control to the transmission medium based on 802.1x
Multiple languages English and Chinese

Update/Setup
Firmware update via FTP/TFTP/HTTP/HTTPS, quick setup in 15 seconds,
mass configuration using GDMS/TR-069 or an encrypted XML configuration file
AES

Nutrition and energy efficiency
Universal Power Adapter (GHP620W/GHP621W)
Input: 100-240 VAC, 50-60 Hz
Output: 12V/0.5A (6W)

Temperature and humidity
Operation: from 0 to 40 °C
Storage: -10 to +60 °C
Humidity: 10 to 90% (non-condensing)

Package Contents
GHP phone, Handset with Cord, Mount, Universal Power Adapter
(GHP620W and GHP621W), front panel, quick installation guide

Colour
White (GHP620, GHP620W), Black (GHP621, GHP621W)

Physical characteristics
210mm (L) * 132mm (W) * 89.8mm (H) (with tube and stand)
Device weight: 560g (GHP620/GHP621), 610g (GHP620W/GHP621W [USA]), 620g (GHP620W/
GHP621W [other countries])
Package weight: 860g g (GHP620/GHP621), 910 g (GHP620W/GHP621W [USA]),
920 g (GHP620W/GHP621W [other countries])