Hi Sir, I set some parameters in simple_pjsua.c. cfg.id = pj_str("sip:" SIP_USER "@" SIP_DOMAIN); cfg.reg_uri = pj_str("sip:" SIP_PROXY); cfg.cred_count = 1; cfg.cred_info[0].realm = pj_str(SIP_DOMAIN); cfg.cred_info[0].scheme = pj_str("digest"); cfg.cred_info[0].username = pj_str(SIP_USER); cfg.cred_info[0].data_type = PJSIP_CRED_DATA_PLAIN_PASSWD; cfg.cred_info[0].data = pj_str(SIP_PASSWD); When I execute this codes, it registers to proxy server. But Proxy send back pckage to require Proxy Auentication Required, as attachment. How can I do setting for this in the example?? Thanks a lot. Lewis -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20081022/2f722454/attachment.html> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: register.txt URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20081022/2f722454/attachment.txt>