Grandstream GRP2604 3‑Line Essential IP Phone

The Grandstream GRP2604 is a reliable 3‑line IP phone designed to deliver essential voice communication with professional-grade features and simplified mass deployment capabilities. Supporting up to six SIP accounts, full-duplex HD audio, advanced noise shielding, and integrated Power over Ethernet (PoE) or dual-band Wi‑Fi, this phone ensures clear communication, flexible connectivity, and enterprise-level security. Ideal for small offices, remote agents, and large-scale installations, the GRP2604 combines reliability, efficiency, and centralized provisioning for seamless performance.

Product Features

Three-Line Support with Six SIP Accounts

Facilitates three active call lines and the registration of up to six SIP accounts, catering to multitasking professionals and dynamic office settings.

Full‑Duplex HD Audio with Noise Shielding

Provides crystal-clear communication with wideband codecs like G.722 and Opus, and intelligent noise-shield technology to reduce background interference.

Five‑Way Local Conferencing

Enables up to five participants to join a local audio conference directly from the desk phone, enhancing collaboration without external conferencing systems.

Flexible Connectivity Options

Available with integrated Power over Ethernet (PoE) and Wi‑Fi variants, offering versatile installation choices and eliminating the need for separate power cables.

Headset Compatibility with EHS

Equipped with an RJ9 headset port and Electronic Hook Switch support, enabling seamless use with wired or wireless headsets for improved productivity.

Enterprise‑Grade Security and Provisioning

Includes features such as secure boot, dual firmware images, encrypted configuration storage, TLS and SRTP encryption, and 802.1x authentication. Fully compatible with zero-touch provisioning and centralized device management systems.

Custom Branding and Durable Design

Features a swappable faceplate for corporate branding, along with dual-position stand and optional wall-mount installation for flexible deployment scenarios.

Product Specifications

• Supports 3 active lines and registration of up to 6 SIP accounts

• 2.21-inch backlit graphical LCD (132 × 48 pixels)

• Dual 10/100 Mbps Ethernet ports; PoE or Wi‑Fi depending on model

• Full-duplex speakerphone and HD handset audio

• Supported codecs: Opus, G.722, G.711 (A/u-law), G.729A/B, G.726, G.723, iLBC

• Five-way local audio conferencing

• Noise-shield technology with background noise reduction

• RJ9 headset port with Electronic Hook Switch support

• Swappable faceplate for custom logos and labeling

• Four context-sensitive soft keys

• Eight dedicated function keys including Mute, Headset, Transfer, Conference, Redial, Hold, Speaker, and Voicemail

• XML/LDAP phonebook support (up to 2,000 entries)

• Call history storage for up to 1,000 records

• Secure boot, dual firmware images, encrypted config storage

• Encryption support: TLS, SRTP; Network authentication: 802.1x

• Quality of Service via 802.1p/Q, ToS, DiffServ, and MPLS

• Provisioning via FTP, TFTP, HTTP, HTTPS, GDMS, and TR-069

• Power source: IEEE 802.3af PoE or 5 V DC/0.6 A adapter (model-specific)

• Maximum power consumption: ~3.8 W (PoE)

• Operating temperature: 0 °C to 40 °C

• Storage temperature: -10 °C to 60 °C

• Humidity: 10 % to 90 % non-condensing

• Dimensions: 208 mm × 180 mm × 63 mm

• Weight: approximately 670 g

• Both desk stand and wall-mount support included