Grandstream GRP2604 3-line Essential IP Phone

Grandstream GRP2604 3-Line Essential IP Phone is a carrier-grade VoIP desk phone designed for enterprise communication, service providers, and high-volume business deployments that require reliable multi-line handling and centralized management. It supports 3 lines, up to 6 SIP accounts, HD audio, 5-way conferencing, and seamless cloud provisioning through Grandstream Device Management System (GDMS). With Gigabit Ethernet connectivity, advanced security features, and optional PoE support, the GRP2604 is built for stable, scalable, and efficient business communications in modern office environments.

Product Features

3-Line Enterprise Communication Support

The GRP2604 supports 3 lines and up to 6 SIP accounts, allowing users to manage multiple extensions, departments, or service providers from a single device. This makes it ideal for reception desks, call-intensive users, and shared office environments.

HD Voice with Full-Duplex Speakerphone

The phone delivers HD audio on both handset and speakerphone with full-duplex performance, ensuring clear, natural conversations even in busy or noisy office settings.

Gigabit Ethernet Connectivity for High-Speed Networks

Dual 10/100/1000 Mbps Gigabit Ethernet ports provide fast, stable network performance, supporting modern unified communication systems and reducing latency in voice traffic.

5-Way Audio Conferencing

Built-in 5-way conferencing enables multiple participants to join calls directly from the device, improving team collaboration without external conferencing tools.

Noise Shield and AI Noise Reduction

Advanced noise reduction technology minimizes background noise for clearer communication, especially useful in open-plan offices and high-traffic environments.

Centralized Cloud Management via GDMS

The GRP2604 is fully supported by Grandstream Device Management System (GDMS), enabling zero-touch provisioning, remote configuration, firmware upgrades, monitoring, and large-scale deployment management.

Enterprise-Grade Security Features

Security features include secure boot, dual firmware images, encrypted storage, TLS, SRTP, and HTTPS support, helping protect communications and prevent unauthorized access.

Professional Headset Integration with EHS Support

An RJ9 headset port with Electronic Hook Switch (EHS) support allows compatibility with professional wireless headsets, improving hands-free productivity in business environments.

Customizable Business Deployment Design

The device supports swappable faceplates, allowing organizations to customize branding and maintain a consistent corporate identity across deployments.

Product Specifications

• Model: Grandstream GRP2604
• Device Type: 3-line essential IP phone
• SIP Accounts: Up to 6 SIP accounts
• Lines: 3 lines
• Display: Backlit graphical LCD
• Display Size: 2.7-inch (132 × 64 pixels)
• Network Ports: Dual 10/100/1000 Mbps Gigabit Ethernet ports
• PoE Support: Available on GRP2604P variant
• Audio: HD voice, full-duplex speakerphone
• Conferencing: 5-way audio conferencing
• Headset Port: RJ9 with EHS support
• Voice Codecs: Opus, G.722, G.711 A-law/U-law, G.729A/B, G.726, G.723, iLBC
• Device Management: Grandstream Device Management System (GDMS)
• Provisioning: Zero-touch provisioning, TR-069, XML configuration support
• Security: TLS, SRTP, HTTPS, secure boot, dual firmware images, encrypted storage
• Call Features: Call hold, transfer, forward, call waiting, call history, speed dial
• Phonebook Capacity: Up to 2,000 contacts
• Call Log Capacity: Up to 800 records
• QoS Support: 802.1Q, 802.1P, DiffServ
• Wall Mount Support: Yes (optional bracket)
• Power Options: External adapter or PoE (GRP2604P variant)
• Ideal Use Cases: Enterprise offices, reception desks, call centers, service providers, and multi-line business communication environments