"VTech Cordless Base Station, The VTech VSP600 is a base station and handset equipped with SIP DECT technology, which delivers excellent sound quality, security and range
The phone features half duplex handset speakerphone and HD Audio with G.722 wideband codec support. The Orbitlink Wireless Technology allows clear conversations while on roam. The handset other features includes friendly interface, 10 selectable ringtones, backlit display, backlit keypad, LED status indicator, message waiting indicator and intercom. VSP600 Features: Call Hold / Call Wait, Call Waiting, Programmable Line / Feature Keys, DECT 6.0 Technology (1.9GHz), Interference-Free & Wide Range, 30 more Battery life, Voice Over Internet Protocol (VoIP), Session Initiation Protocol (SIP), Caller ID / Call Waiting, Expandable Up To 6 Handsets, Half-duplex speakerphone, 90 x 65 Backlit Display, Backlit Keypad, LED Status Indicator, Name / Number Caller ID Memory, 200 Station Phone Directory / Dialer, Call Log, Call Block, 3-Way Conferencing, Call Forwarding, Message Waiting Indicator, 10 Selectable Ringtones, Volume Control, Intercom, Call Transfer, Handset Locator, Auto Answer, 2 Softkeys For Feature Integration w/ M1 System, Redial, Hold, Mute, Flash, Do Not Disturb, Up To 7 Hours Talk Time, Up To 7 Days Standby, Orbitlink Wireless Technology&trade, N-way conferencing via hosted service, Keypad lock, Geneband, Support for Software Update Over the Air, Support for WebUT Customization, Support for custom default file provisioning, Support for up to 6 SIP lines, Advanced call handling, Simultaneous call handling, Intuitive design, Call History, Call Paging, Fail Over Support & Server Redundancy, 2 Way - Navigational Pad, Supports up to 4 outgoing calls in parallel, Multi-Line Support, Supports: Auto IP provisioning, IPv4, DHCP Client, DNS, HTTPS, SNTP Client, Supports: HD Voice, G.711, G.726, G.729 & G.722 Wideband Codecs, Qo"