For Yealink SIP-T57W, everyone has different special concerns about it, and what we do is to maximize the product requirements of each customer, so the quality of our Yealink SIP-T57W has been well received by many customers and enjoyed a good reputation in many countries. Importgm International limited Yealink SIP-T57W have characteristic design & practical performance & competitive price, for more information on the Yealink SIP-T57W, please feel free to contact us.