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Grandstream Compact Hotel IP Phone Black GHP621 40A Isolator this equipment is effective andProduct Description The GHP621 IP Phone features one HD speaker on each handset, 2 SIP accounts, 2 lines, 6 programmable keys, 10 speed dial keys, 3 way voice conferencing, full band Opus voice codec, and Advanced jitter resilience algorithm that tolerates up to 30% packet loss without impacting voice quality The GHP621 is supported by Grandstreams Device Management System (GDMS), which provides a centralized Interface to configure, provision, manage