i am currently using linux although i am new at it. i notice that in pjsip library there is a folder called hmac, with the hmac.c and hmac.h files it is found in third_party what i want to do is call the function that does the authentication and that is found in hmac folder from the file stream.c that is found in pjmedia folder can someone tell me how to do that please? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20111225/ca89ef6f/attachment.html>