The Grandstream GRP2603 is a 3-line essential IP phone designed for small to medium-sized businesses seeking a reliable and cost-effective communication solution. It is part of Grandstream’s GRP series, known for its carrier-grade features and ease of deployment.

Key Specifications

• Display: 2.48-inch (132×48) backlit monochrome LCD

• Lines & SIP Accounts: 3 lines, supports up to 6 SIP accounts

• Ethernet Ports: 2 x 10/100/1000 Mbps Gigabit Ethernet ports

• Power over Ethernet (PoE): Integrated 802.3af Class 1 (GRP2603P model)

• Audio Codecs: G.711u/a, G.729A/B, G.722, G.723, G.726, iLBC, Opus

• Speakerphone: Full-duplex with HD audio

• Headset Support: RJ9 with Electronic Hook Switch (EHS) support for Plantronics, Jabra, and Sennheiser headsets

• Local Conferencing: 5-way audio conferencing

• Security Features: Secure boot, dual firmware images, encrypted data storage

• Device Management: Supports Grandstream Device Management System (GDMS) for centralized provisioning and management

• Customization: Swappable faceplate for easy branding