Yealink T2 Series - Designed for business users who need rich telephony features, a friendly user-interface and superb voice quality. High-definition voice quality, large display, up to 48 keys for users seeking a more traditional key telephone system experience.  Includes the 29G IP Phone, 27G IP Phone, 27P IP Phone, 23G IP Phone, 23P IP Phone, 21P E2 IP Phone, 19P E2 IP Phone.