The source files for Linphone are linked from found on the softwares home site :
The download pages are hosted on the Free Software Foundations software repositry.
http://download.savannah.nongnu.org/releases/linphone/
At the time of writing the most recent stable version of the software is version 1.3.5 , the file used for writing this manual is:
http://download.savannah.nongnu.org/releases/linphone/1.3.x/source/linphone-1.3.5.tar.gz
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