Yealink SIP-T28P na 1-Handset 6-Line Landline Telephone (Power supply not included - PS5V1200US) 320x160 graphic LCD with 4-level grayscales BLF/BLA, SMS, Voicemail, Intercom 48 Keys including 16 programmable keys 6 VoIP accounts, Broadsoft/Avaya/Asterisk validated HD Voice; HD Codec, HD Handset, HD Speaker