Grandstream GRP2604 3-Line Essential IP Phone
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Common issues and fixes
Reviewed troubleshooting steps are not yet available for this model.
Ask AIM Telecom about this productAbout this product
• The GRP2604 is a 3-line carrier-grade IP phone designed for mass deployment and easy management. It features zerotouch provisioning, making it ideal for on-site or remote desktop workers.
Key Features:
• 5-way voice conferencing for enhanced productivity
• Full HD audio on both speaker and handset for clear communication
• Electronic Hook Switch (EHS) support for Plantronics, Jabra, and Sennheiser headsets
• Multi-language support for global compatibility
• Enterprise-level security features, including secure boot, dual firmware images, and encrypted data storage
Additional Information:
• Weight: 2.47 lbs
• Dimensions: 11.73 × 8.31 × 3.19 in
• Brand: Grandstream
Technical Specifications:
• Protocols/Standards: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, RTCP-XR, HTTP/HTTPS, ARP, ICMP, DNS(A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP, LDAP, TR069, SNMP, 802.1x, TLS, SRTP, IPv6
• Network Interfaces: Dual switched auto-sensing 10/100/1000 Mbps Ethernet ports
• Graphic Display: 132 x 64 (2.7’’) backlit graphical LCD display
• Feature Keys: 3 line keys with dual-color LED and support for 6 SIP accounts, 4 XML programmable context sensitive soft keys, 5 navigation, menu, and BLF/SOFD keys.
• Voice Codecs and Capabilities: Support for G.729A/B, G.711µ/a-law, G.726, G.722(wide-band), G.723,iLBC, OPUS, in-band and out-of-band DTMF(in audio, RFC2833, SIP INFO), VAD, AEC, CNG, PLC, AGC, AJB
Key Features:
• 5-way voice conferencing for enhanced productivity
• Full HD audio on both speaker and handset for clear communication
• Electronic Hook Switch (EHS) support for Plantronics, Jabra, and Sennheiser headsets
• Multi-language support for global compatibility
• Enterprise-level security features, including secure boot, dual firmware images, and encrypted data storage
Additional Information:
• Weight: 2.47 lbs
• Dimensions: 11.73 × 8.31 × 3.19 in
• Brand: Grandstream
Technical Specifications:
• Protocols/Standards: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, RTCP-XR, HTTP/HTTPS, ARP, ICMP, DNS(A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP, LDAP, TR069, SNMP, 802.1x, TLS, SRTP, IPv6
• Network Interfaces: Dual switched auto-sensing 10/100/1000 Mbps Ethernet ports
• Graphic Display: 132 x 64 (2.7’’) backlit graphical LCD display
• Feature Keys: 3 line keys with dual-color LED and support for 6 SIP accounts, 4 XML programmable context sensitive soft keys, 5 navigation, menu, and BLF/SOFD keys.
• Voice Codecs and Capabilities: Support for G.729A/B, G.711µ/a-law, G.726, G.722(wide-band), G.723,iLBC, OPUS, in-band and out-of-band DTMF(in audio, RFC2833, SIP INFO), VAD, AEC, CNG, PLC, AGC, AJB
More product details
The Grandstream GRP2604 is a practical choice for businesses that need a reliable, no-nonsense desk phone for everyday use. It fits well in cubicle farms, open-plan offices, and home-office setups where a worker handles a moderate volume of calls across a few lines. Because it supports up to six SIP accounts across its three line keys, it suits roles like customer service or inside sales where an employee might monitor a personal extension, a department queue, and a general line simultaneously. The zerotouch provisioning and TR-069 support make it especially attractive for IT teams managing fleets of phones across multiple locations, including remote workers scattered around the GTA or beyond.
This model pairs naturally with hosted VoIP platforms that support Grandstream’s provisioning framework, and it works well alongside entry-level headsets from Plantronics, Jabra, or Sennheiser thanks to its built-in EHS support. The full-duplex speakerphone and wideband audio codec support mean it can hold its own in a small huddle room, though it is not a replacement for a dedicated conference speaker. For a business migrating from older ATA-plus-analog-phone setups, the GRP2604 offers a clean, modern alternative without stepping up to a touchscreen or video endpoint.
A buyer should understand that the 132 x 64 pixel backlit display, while perfectly legible for call handling and directory lookups, is not a high-resolution screen. It is not designed for rich visual applications or extensive on-screen contact browsing. The phone also lacks built-in Wi-Fi or Bluetooth, so it must be connected via Ethernet, and any wireless headset pairing will require a dedicated base or adapter. For a desk that cannot easily reach a network drop, this may mean adding a small switch or powerline adapter.
For a receptionist or executive assistant who juggles a high volume of lines and needs a large sidecar or a colour screen with quick visual scanning, the GRP2604 may feel underpowered. In those cases, a model with a larger display and expansion module support would be more appropriate. Conversely, for a common-area phone in a break room or hallway where only occasional calls are made, this device is overbuilt; a simpler single-line phone would serve just as well at a lower cost.
This model pairs naturally with hosted VoIP platforms that support Grandstream’s provisioning framework, and it works well alongside entry-level headsets from Plantronics, Jabra, or Sennheiser thanks to its built-in EHS support. The full-duplex speakerphone and wideband audio codec support mean it can hold its own in a small huddle room, though it is not a replacement for a dedicated conference speaker. For a business migrating from older ATA-plus-analog-phone setups, the GRP2604 offers a clean, modern alternative without stepping up to a touchscreen or video endpoint.
A buyer should understand that the 132 x 64 pixel backlit display, while perfectly legible for call handling and directory lookups, is not a high-resolution screen. It is not designed for rich visual applications or extensive on-screen contact browsing. The phone also lacks built-in Wi-Fi or Bluetooth, so it must be connected via Ethernet, and any wireless headset pairing will require a dedicated base or adapter. For a desk that cannot easily reach a network drop, this may mean adding a small switch or powerline adapter.
For a receptionist or executive assistant who juggles a high volume of lines and needs a large sidecar or a colour screen with quick visual scanning, the GRP2604 may feel underpowered. In those cases, a model with a larger display and expansion module support would be more appropriate. Conversely, for a common-area phone in a break room or hallway where only occasional calls are made, this device is overbuilt; a simpler single-line phone would serve just as well at a lower cost.