hi, you are making separate program(test_pjsua) and calling pjsua function right? if this is condition i would give you advice 1st follow all the steps which is giving in ------- http://www.pjsip.org/using.htm#using follow all 6 steps carefully.... basically that comes due to step4: declare macros step 5: right click on your separate -program->propertypage->linker->inputl->additional dependencies , like * pjlib-i386-win32-vc6-debug.lib*....... all yours lib files, again completing of these steps, right click on your program and go to Program dependencies and tick all the dependency... because it is based on completely dependencies , so the problem is with your linking way, check all include and lib files also. Regards New_bie -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090121/266046f2/attachment.html>