Telephone Type: IP Deskphone Voice Mail Capability: YES Speakerphone: Full-duplex speakerphone Display Type: LCD Display - color Volume Control: Individual volume settings Hearing Aid Compatible: Hearing aid compatibility to ITU-TP.370 and TIA 504A standards; Hearing aid compatible (HAC) handset for magnetic coupling to hearing aids; USB Type-A headset support Network Protocols: Ethernet Power Over Ethernet (PoE) Support: YES Voice Codecs: G.711 (A-law and -law); G.722; G.729A; G.722.1; G.722.1C; G.719; iLBC; OPUS; SILK; Siren 14 Key / Function Button: Dedicated Microsoft Teams button Model: CCX 350 Dimensions & Miscellaneous Color: Black