The Yealink T56A, compatible with Microsoft Skype for Business and Office365, brings a superior Skype for Business-tailored experience and functionality to your desktop. Upgrading from Yealink T4S Series (Skype for Business Edition), the T56A not only features a 7-inch multi-point touch screen, but also owns a better Skype-tailored user interface and a faster response speed, all of these make collaboration easier than ever. Presenting a standalone voice solution and an unparalleled audio clarity, the T56A is armed with Yealink's Optima HD Voice technology and SILK speech codec. Moreover, T56A enhances your office productivity by supporting multi phone functions, including Skype for Business conference, calendar, CAP, hot desking, Boss/Admin. With the Yealink EXP50 Expansion Module, the phone extends up to 180 contacts.