GRANDSTREAM GRP2603P 3 Line IP Phone, 6 SIP Accounts, 132x48 Backlit Screen, HD Audio, Powerable Via POE3 Line Essential IP Phone GRP2603P Part of the GRP series of Carrier Grade IP Phones, the GRP2603 is an essential 3 line model designed with zerotouch provisioning for mass deployment and easy management. It features a sleek design and a suite of nextgeneration features including: 5 way voice conferencing to maximize productivity, integrated PoE (GRP2603P), full HD audio on both the speaker and handset to allow users to communicate with the utmost