Polycom 2200-48350-019, VVX 311 - MS Skype for Business Edition. This model is qualified for Skype for Business and Microsoft Lync, as well as Microsoft Office 365, and includes a required Polycom UCS license for these platforms. Seamless integration of a reliable desk phone with superior audio improves your employees UC experience, driving adoption and increasing productivity. Polycom VVX 311 includes Gigabit Ethernet speed and is fully PoE compliant. The VVX 311 has six line appearances and four soft keys on the bright monochromatic display. Polycom HD Voice brings incredible, wideband sound quality to your VoIP phone. The VVX 311 differs from the VVX 310 by having an improved processor and increased memory, future-proofing your investment.