Yealink SIP-T19 - Manual (Page 4)

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Yealink SIP-T19P/SIP-T19 IP phone firmware contains third-party software under the GNU General Public
License (GPL). Yealink uses software under the specific terms of the GPL. Please refer to the GPL for the exact
terms and conditions of the license.
The original GPL license, source code of components licensed under GPL and used in Yealink products can
be downloaded online:
http://www.yealink.com/GPLOpenSource.aspx?BaseInfoCateId=293&NewsCateId=293&CateId=293 .