HP 4120 IP Phone Series (J9766A) All Lync-optimized IP phone features are supported by the HP 4120 IP Phone Series, including Microsoft's "Better Together" mode, which leverages Lync's powerful collaboration capabilities. The HP 4120 IP Phone Series is ideal for small enterprises and small-to-medium size businesses who wish to reduce infrastructure spending and provide the benefits of unified communications delivered through cloud services. Optimized for seamless operation with Microsoft Lync Unified Communications: - provides a rich set of unified communications features.