Hi, Can any one please let me know how declare OS macros. I'm using visual studio 2003.net. In the pjsip.org web site it has mentioned that we need to declare OS macros in order to use PJPROJECT with applications. Please tell me in detail how can I do that in visual studio 2003.net. Regards Piyumali -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20081110/aa9fc85b/attachment.html>