IP Phones and Terminals / Grandstream
GXP1620
The GXP1620 is a basic/business IP phone designed for small to medium-sized offices that need a simple, reliable device with HD voice quality. It supports two SIP lines, has a backlit LCD screen, and offers essential VoIP telephony features—ideal for environments with moderate call volume.
Main features
- 2 lines / 2 SIP accounts
- Display: Backlit graphic LCD 132 × 48 pixels
- HD audio in handset and speakerphone
- Full-duplex hands-free with echo cancellation
- Programmable soft keys (3 XML context keys)
- Telephony functions: call waiting, call transfer, call forwarding, call hold, call waiting, contact list, call history, hot-desking/shared-call appearance, etc.
- Supported codecs: G.711µ/a, G.722 (wideband), G.729A/B, G.726, G.723, iLBC; DTMF RFC2833 or SIP-INFO; support for VAD, CNG, AEC, PLC, AGC, etc.
- Security: SIP/TLS, SRTP, AES-256, 802.1x support for network access control.
- Provisioning / Management: HTTP/HTTPS, TFTP, TR-069, encrypted XML files.
Technical specifications
SIP lines
2 lines / 2 SIP accounts
Screen
LCD 132×48 px (backlit)
Audio
HD (headphone & speaker, full-duplex)
Soft keys
3 programmable XML keys
Conference
3-way
Codecs
G.711, G.722, G.729A/B, G.726, G.723, iLBC, DTMF
BLF / Speed Dial
— (it does not have dedicated BLF keys)
Network ports
2×10/100 Mbps (no Gigabit)
PoE
No (basic model)
Security / Encryption
SIP/TLS, SRTP, AES-256, 802.1x
Provisioning
HTTP, HTTPS, TFTP, TR-069, Encrypted XML
About the brand
The GXP1620 belongs to Grandstream’s basic series (16xx series), designed for small to medium-sized businesses that require essential VoIP features with good voice quality at an affordable cost — ideal as an entry point to corporate VoIP without excessive features.

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