Yealink Firmware & Technical Manuals
http://www.yealink.com/SupportDownloadfiles.aspx?CateId=147&parentcateid=142
Modified on: Fri, Feb 19, 2016 at 12:27 PM
http://www.yealink.com/SupportDownloadfiles.aspx?CateId=147&parentcateid=142
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