Introduction magicJack for BUSINESS offers this user-friendly cordless phone, the Yealink T21P Business Phone. General Overview magicJack for BUSINESS offers this user-friendly cordless phone, the Yealink T21P Business Phone. Busy Lamp Field Learn more about the busy lamp indicator and how to interact with it. Call History Find how to access call history. Call Transfer Learn how to transfer calls to and from each phone. Conference Calling Learn how to begin and configure conference calling. Directories Learn how to access and interact with in-phone directories. Do Not Disturb Learn how to enable and operate the DND features. Hold and Mute Learn how to hold phone calls and put an active call on mute. Multiple Calls Learn more about how to handle multiple calls. Placing and Answering Calls Placing and answering phone calls using the T21 E2. Redialing Learn how to redial and other various operations. Voicemail Learn how to access and interact with voicemails.