Grandstream GRP2603 Essential IP Phone

The GRP2603 is a carrier-grade 3-line IP phone designed for enterprises and service providers. With support for 6 SIP accounts, HD audio, advanced security features, PoE (in the GRP2603P variant), and centralized provisioning via GDMS, it’s built for large-scale, high-performance deployments.

Grandstream GRP2603 Essential IP Phone Specifications

• Lines & SIP Accounts: 3 lines, 6 SIP accounts, 3 call appearances

• Display: 2.48″ backlit graphical LCD (132×64 pixels)

• Networking: Dual auto-sensing Gigabit Ethernet ports

• PoE Support: Included in GRP2603P variant (IEEE 802.3af, Class 1)

• Audio: HD audio on handset and speakerphone; noise shield technology; full-duplex

• Conferencing: Supports up to 5-way local audio conferencing

• Headset Support: RJ9 port with EHS (Plantronics, Jabra, Sennheiser compatible)

• Codecs: Opus, G.711, G.722, G.723, G.726, G.729, iLBC

• Security Features: Secure boot, dual firmware images, AES-256 configuration encryption, SRTP, TLS, 802.1x

• QoS Support: 802.1Q/p VLAN tagging, DiffServ, MPLS

• Provisioning: Zero-touch provisioning via GDMS, TR-069, or encrypted XML configuration files

• Power: 5V DC, 600mA (external adapter); PoE for GRP2603P

• Dimensions: 214 × 206 × 68 mm

• Weight: Approx. 780g