Find the latest firmwares, installation guides, brochures,
datasheets and more for all our products


Part of the GRP series of Carrier-Grade IP Phones, the GRP2603 is an essential 3-line model designed with zero-touch provisioning for mass deployment and easy management. It features 5-way voice conferencing to maximize productivity, integrated PoE (GRP2603P), and is supported by Grandstream’s Device Management System (GDMS). Built for the basic needs of on-site or remote desktop workers the GRP2603 offers an easy-to-use and easy-to-deploy voice endpoint.

GRP2603 Datasheet - English

GRP2603 Datasheet - French

GRP2603 Datasheet - German

GRP2603 Datasheet - Italian

GRP2603 Datasheet - Polish

GRP2603 Datasheet - Portuguese

GRP2603 Datasheet - Russian

GRP2603 Datasheet - Spanish


GRP26xx Series - CTI Guide

GRP26xx Series - DNS SRV Guide

GRP26xx Series - Hot Desking Guide

GRP26xx Series - Multicast Paging Guide

GRP26xx Series - Plug and Play Guide

GRP2600 Series Sell Sheet english

GRP2600 Series Sell Sheet french

GRP2600 Series Sell Sheet german

GRP2600 Series Sell Sheet italian

GRP2600 Series Sell Sheet portuguese

GRP2600 Series Sell Sheet russian

GRP2600 Series Sell Sheet spanish

GRP26xx Series - Server Redundancy Guide

GRP26xx Series - VLAN Guide

GRP260X Administration Guide

GRP260X Quick User Guide - English

GRP260x user guide

GRP260x Wall Mount QIG

GRP26XX Security Manual

phonebook editor user guide

GS Affinity Guide

GS Provisioning Guide

GRP260X Broadworks SCA Guide

GRP260X VPK Guide

GRP260x Headset Compatibility List.pdf

GRP260X Quick User Guide - Spanish