The GHP Series of hotel phones feature the GHP621 and GHP621W, easy-to-use IP phones for any hotel room that can be programmed and customized based on the needs of hotels and their guests. This Series features an HD speaker, 2 SIP accounts/lines, 6 programmable keys, 10 speed dial keys, 3-way voice conferencing, supports the full-band OPUS voice codec and provides an advanced jitter-resilience algorithm that tolerates up to 30% packet loss without impacting voice quality. The GHP Series is supported by Grandstreams Device Management System (GDMS), which provides a centralized interface to configure, provision, manage and monitor deployments of Grandstream endpoints. GHP series IP phones can be installed on desktop or wall-mounted and can be powered by power adapter GHP621, and USB Type-C charger. Thanks to a sleek and compact design, the GHP621 are the ideal fit for not only hotels but also apartments, dormitories, hospitals, retail and much more.