I am trying to send register request using simple_pjua sample, the server sends the 401 error with " WWW-Authenticate: Digest realm="open-ims.test",nonce="xMlb942+5SHM68+d8Ah4xbWPRqTZjwAAtoxNjttEn5Q=", algorithm=AKAv1-MD5 " the sample just drop the response, and there is no module handle it in call back functions. I add #define PJSIP_HAS_DIGEST_AKA_AUTH 1 to the site_config.h, but the issue is still not fixed. my question is: 1. is there any exist call back function in module can handle this by sending a new register request with authentication information. 2. How can I add new functions to handle this kind of response? Thanks in advanced. Yonggang -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20101219/0a7a4f3e/attachment.html>