The Yealink SIP-T56A combines simple operation with modern technology. The most important information is displayed on the 7-inch capacitive touch screen with practical speed dialling options. The current audio codecs such as G.722, G.711 and also the new OPUS codec are supported. Modern equipment The SIP-T56A comes with the Android 5.1.1 operating system and pre-installed applications such as e-mail client, calendar and much more. The large, tiltable touch screen and the 27 speed-dial keys with individually adjustable functions simplify everyday work enormously. The VoIP phone with Gigabit switch can be operated via PoE, supports up to 16 SIP accounts and the new Opus codec. Bluetooth 4.0 with headset profile, USB port for headsets and WLAN 802.11b/g/n is also integrated. The device can be wall-mounted and supplemented with up to three expansion modules (EXP50), each offering 60 additional speed-dial memory locations. Android 5.1.1 The Android operating system was adapted to the VoIP environment by Yealink to ensure a high level of security. For example, third-party applications can only be installed via auto-provisioning and only by the administrator. A normal user cannot simply install an application as usual with Android smartphones. Applications such as e-mail, calendar, recorder, file manager, browser and much more are already pre-installed. Three individually adjustable "homescreens" are also available.