Statement on the Open Source Software of Yealink IP Phones

Yealink IP Phone products utilize some software from the open source community. Therefore, you must obtain the licenses according to the specific license terms applicable to the software. The following table lists the license information of the open source software used by Yealink T3X, T4XU, and T5XW IP phone series, for reference only. Yealink will provide the source code and license of the open source software as you need.

Open Source Software	Version	License	Link
Mtd-Utils		GPLv2	http://git.infradead.org/mtd-utils.git
Linux Kernel	4.9.75	GPLv2	https://git.kernel.org/
OpenVPN	2.4.9	GPLv2	https://openvpn.net/
LibPcap	4.1.3	BSD	https://github.com/patmarion/winpcap/tree/master/
IpTable	1.4.2	GPLv2	https://www.netfilter.org/pub/iptables/
BusyBox	1.10.3	GPLv2	https://www.busybox.net/downloads/
C-Ares-Dns	1.9.1	MIT	https://c-ares.org/download/
Curl	7.77.0	MIT	https://github.com/curl/curl/archive/master.zip
OpenLDAP	2.4.46	GNU, GPL	https://git.openldap.org/jotik/openldap/-/tags/OPENLDAP_REL_ENG_2_4_46
OpenSSL	1.1.1g	Apache	https://www.openssl.org/source/old/1.0.2/openssl-1.0.2n.tar.gz
PJSIP	2.3	GPLv2	https://github.com/pjsip/pjproject/releases/tag/2.3
SRTP	2.3.0	GPL	https://github.com/cisco/libsrtp/releases/tag/v2.3.0
libusb	1.0.23	the GNU Lesser General Public License	https://github.com/libusb/libusb/archive/master.zip
libhid	0.8.0-rc1	GNU General Public License	https://github.com/libusb/hidapi/archive/master.zip
Wap_Supplicant	2.9	GPLv2	https://www.linuxfromscratch.org/blfs/view/8.1/basicnet/wpa_supplicant.html
libwebsockets	3.2	MIT	https://github.com/warmcat/libwebsockets
expat	2.1.0	MIT	https://sourceforge.net/projects/expat/files/expat/2.1.0/
libstrophe	0.8	MIT, GPLv3	https://github.com/strophe/libstrophe
thrift	0.10.0	Apache	https://downloads.apache.org/thrift/0.10.0/
rapidjson	1.1.0	MIT	https://github.com/Tencent/rapidjson
pugixml	1.2	MIT	https://source.openmpt.org/svn/openmpt/tags/1.23.05.00/include/pugixml/docs/quickstart.html
dnsmasq	2.85	GPLV2	https://thekelleys.org.uk/dnsmasq/
pppd	2.4.3	BSD	https://github.com/ppp-project/ppp
xl2tpd	1.3.15	GPLV2	https://github.com/xelerance/xl2tpd/
freetype	2.10.1	FTL	https://www.freetype.org/
libjpeg		Custom free software license	https://sourceforge.net/projects/libjpeg/reviews
libpng	1.6.34	Zlib license	http://www.libpng.org/pub/png/libpng.html
mtdev		MIT (X11) License	http://bitmath.org/code/mtdev/