Grandstream GRP2603 3-line Essential IP Phone

Grandstream GRP2603 3-Line Essential IP Phone is a carrier-grade VoIP desk phone designed for small businesses, enterprises, service providers, and remote work environments. Built for reliability and large-scale deployment, the GRP2603 supports up to 3 SIP accounts and 6 line keys, delivering professional HD voice communications, advanced security protection, and centralized management through Grandstream Device Management System (GDMS). With its user-friendly interface, 5-way audio conferencing, and streamlined provisioning capabilities, the GRP2603 provides an efficient and cost-effective communication solution for modern business operations.

Product Features

Support for 3 SIP Accounts and 6 Line Keys

The GRP2603 supports up to 3 SIP accounts and 6 virtual multi-purpose line keys, enabling users to efficiently manage multiple calls, extensions, and communication workflows from a single device.

HD Audio Quality

Equipped with HD voice technology, the GRP2603 delivers crystal-clear audio through both the handset and full-duplex speakerphone, ensuring professional-quality conversations and improved communication efficiency.

5-Way Audio Conferencing

Built-in 5-way audio conferencing allows teams to conduct conference calls directly from the phone, improving collaboration without the need for additional conferencing equipment.

Noise Shield Technology

Grandstream’s Noise Shield technology minimizes background noise and distractions, enhancing call clarity and providing a superior communication experience in busy office environments.

Centralized Device Management

The GRP2603 is fully supported by Grandstream Device Management System (GDMS), allowing administrators to provision, configure, monitor, and manage devices from a centralized cloud platform.

Enterprise-Grade Security

Advanced security features including secure boot, dual firmware images, encrypted data storage, TLS encryption, and SRTP technology help protect business communications and sensitive information.

EHS Headset Support

Electronic Hook Switch (EHS) support enables compatibility with supported wireless headsets, providing greater mobility and convenience for professionals who spend significant time on calls.

Large Contact Directory

The phone supports a substantial phonebook capacity, allowing users to store and quickly access important business contacts.

Zero-Touch Provisioning

Automated provisioning capabilities simplify deployment and management, making the GRP2603 ideal for service providers and organizations with multiple locations.

Professional and Space-Saving Design

Its compact and modern design fits seamlessly into office desks, reception counters, customer service stations, and remote workspaces.

Product Specifications

• Model: Grandstream GRP2603
• Product Type: Essential Carrier-Grade IP Phone
• SIP Accounts: 3
• Line Appearances: 6 Virtual Multi-Purpose Keys
• Display Type: Backlit Graphical LCD Display
• Display Size: 2.41 Inches
• Ethernet Ports: Dual 10/100 Mbps Ethernet Ports
• HD Audio: Supported on Handset and Speakerphone
• Speakerphone: Full-Duplex HD Speakerphone
• Audio Conferencing: 5-Way Audio Conferencing
• Noise Reduction: Noise Shield Technology
• Security Features: Secure Boot, Dual Firmware Images, Encrypted Data Storage, TLS, SRTP
• Device Management: Grandstream Device Management System (GDMS)
• Headset Support: RJ9 Headset Port with EHS Support
• Phonebook Capacity: Up to 2,000 Contacts
• Call History Capacity: Up to 800 Records
• Provisioning: Zero-Touch Provisioning
• Network Protocols: SIP, TCP/IP, UDP, RTP, HTTPS, LDAP, IPv4, IPv6
• Wall Mountable: Yes
• Power Supply: External Power Adapter
• QoS Support: Layer 2 and Layer 3 QoS
• Operating Temperature: 0°C to 40°C
• Deployment: Small Businesses, Enterprises, Service Providers, Remote Offices, and Call Centers
• Cloud Management: Supported via GDMS
• Color: Black

Difference Between GRP2603 and GRP2603P

This phone comes in two main versions depending on how it gets its power:

Features	Grandstream GRP2603	Grandstream GRP2603P
PoE (Power over Ethernet) power	It is not connected to PoE.	It transmits power and data through a single network cable (PoE).
Power Supply Unit (PSU)	It comes with a wall power adapter in its box.	It often does not come with a wall adapter as it relies on a PoE switch.