Hi you forgot to link a static libs to your project. You can link it in Project->Properties->Linker->Input->Additional Dependencies (also don't forget to set paths in Linker->General->Additional Library Directories) Also you can do this from the code. In your main.cpp (or other named main file with entry point) you can write: #pragma comment(lib,"<path>/libname.lib") The static libs you need are located at the pjproject folder and it subfolders - for example "pjlib/lib" or "pjsip/lib". If you don't have there a .lib files you must to build a pjproject solution. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090619/dfa6b30b/attachment.html>