Thanks waqas arshad. Can anybody tell which version of Window SDK will be suitable?Currently I am using visual c++ version 6 on window 7. regards pranab -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20110530/5ed5042d/attachment.html>