About this product 20 line session start protocol in 3 directions, hot spot high-definition sound on speakerphone and phone receiver external goose neck microphone movable main color display 4.3 inches, side color display 2 × 3.5 inches for DSS keys built-in Bluetooth connection features call answer / reject mute / unmute (microphone) hold / resume call call waiting caller ID display secret call anonymous call (hide caller ID) call forwarding (always / busy / no answer) call transfer (attended / unattended) end call / pick up (depending on server) redial do not disturb auto-answer voice message (on server) 3-way conference hotline
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