Gigaset GIGASET-A580IP Dual-Mode IP Phone with HD Sound and 3 Line Display VoIP Phone and Device Dual Mode to switch between landline and IP calls Multi-Line for up to 6 Handsets and 6 SIP accounts Illuminated LCD Display with 3 Lines High Definition Sound Performance Online Net Directory and Yellow Pages Search Multi-line functionality for up to 6 handsets and 6 accounts from different providers Online net directory and Yellow Page search HDSP ringer melody output via handsfree speakerphone Programmable up to 150 numbers and names Up to 3 calls in parallel: 2 Internet calls and 1 fixed-line call with multiple handsets