Description

The Grandstream GRP2602G is part of the “GRP” series of carrier-grade IP phones designed for mass deployment in enterprise, service-provider and remote/desktop worker environments.
This particular model is the 2-line version (2 physical line keys) and supports up to 4 SIP accounts. It adds Gigabit-Ethernet ports and integrated PoE (Power over Ethernet) for streamlined wiring and deployment. It’s built with “zero-touch” provisioning in mind (via Grandstream’s Device Management System, GDMS) so a service provider or IT administrator can deploy large numbers of phones with minimal on-site configuration. 
In short: if you want a reliable, basic desk IP phone with enterprise-level audio, provisioning and security features — the GRP2602G is a strong candidate.

Key Features

Here are some of the standout features of the GRP2602G:

• Supports 2 lines and 4 SIP accounts, giving flexibility for multiple extensions or service providers. 

• Built-in Gigabit Ethernet (dual switched ports) for high performance network connectivity and “pass-through” of another device. 

• Integrated PoE (IEEE 802.3af Class 1) support — so power and network come through the Ethernet cable (no separate power adapter needed if your switch supports PoE). 

• Full-duplex speakerphone and handset with HD audio / wide-band support, plus “Noise-Shield” technology to reduce background noise. 

• Support for EHS (Electronic Hook Switch) with popular headset brands (Plantronics, Jabra, Sennheiser) — useful for call-centres or heavy handset usage. 

• 5-way conferencing built in (i.e., up to five participants on one call) to support internal team calls without requiring external conference hardware. 

• Enterprise-grade security features: secure boot, dual firmware images (for fallback), encrypted data storage. 

• Cloud or centralized management via Grandstream’s Device Management System (GDMS) — making it easier to provision, monitor, upgrade large deployments remotely. 

• Customizable faceplate (logo or branding) and multi-language support, making it friendly for diverse environments. 

Specifications

Here are the full technical specifications (as gathered from the manufacturer and datasheets):

General

• Model: GRP2602G (2-line Essential IP Phone) 

• Display: Back-lit graphical LCD, 132 × 48 pixels (approx 2.4″) 

• Line keys: 2 physical line keys with dual-colour LEDs; supports 4 SIP accounts 

• Soft keys & function keys: 4 XML programmable soft keys, 5 navigation/menu keys, 8 dedicated function keys (Message, Transfer, Headset, Mute, Send/Redial, Speakerphone, Vol+, Vol-) 

• Headset port: RJ-9 headset jack supporting EHS for Plantronics/Jabra/Sennheiser 

Network & Interfaces

• Dual switched auto-negotiation 10/100/1000 Mbps (Gigabit) Ethernet ports (for network pass-through) — this is specific to the “G” model. 

• Integrated PoE (IEEE 802.3af) support. 

• IP address assignment: DHCP, PPPoE 

  Protocols supported: SIP (RFC 3261), TCP/IP/UDP, RTP/RTCP, RTCP-XR, HTTP/HTTPS, ARP, ICMP, DNS, STUN, LLDP, LDAP, TR-069, SNMP, TLS, SRTP, IPv6. 

• QoS support: Layer 2 (802.1Q VLAN, 802.1P), Layer 3 (ToS, DiffServ, MPLS)

Audio & Voice Features

• Wide-band audio, HD handset & speakerphone 

• Voice codecs supported: G.729A/B, G.711 µ/a, G.726, G.722 (wideband), G.723, iLBC, OPUS. 

• Voice features: DTMF (in audio/out-of-band, RFC2833, SIP INFO), VAD (voice activity detection), AEC (acoustic echo cancellation), CNG (comfort noise generation), PLC (packet loss concealment), AGC (automatic gain control), AJB (adaptive jitter buffer) 

• Conference: 5-way audio conferencing 

• Call hold, transfer, forward

• Call park/pickup

• Shared-Call Appearance (SCA), Bridged-Line Appearance (BLA) 

• Call waiting, call log (up to 800 records) 

• Phonebook: XML, LDAP downloadable, up to ~2000 items 

Security

• Secure boot, dual firmware images

• 256-bit AES encrypted configuration files

• TLS / SRTP support

• 802.1x network authentication support (wired) 

Physical & Power

• Weight: ~670 g (unit) 

• Dimensions: ~208 mm (L) × 180 mm (W) × 63.4 mm (H) with handset 

• Operating temperature: 0°C to 40°C; Storage: –10°C to 60°C; Humidity: 10% to 90% non-condensing

• Power: Via PoE (IEEE 802.3af) OR optional power supply (100-240V AC input, +5VDC output) depending on region/model. 

Miscellaneous

• Mounting: Desktop base stand (single angle ~45°) included; Wall-mountable with optional bracket. 

• Multi‐language support: English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, Chinese, Korean, Japanese, and more. 

• Customizable faceplate – for branding/logos.