That is not a PJSIP error, that response is coming from the server. From: pjsip-bounces@xxxxxxxxxxxxxxx [mailto:pjsip-bounces at lists.pjsip.org] On Behalf Of ligen Sent: Monday, September 03, 2012 5:15 AM To: pjsip Subject: pjsua_acc_del call error Dear ALL: I am so sorry , I englist is very pool. I using PJSIP v2.0.1 win32-5.1/i386/msvc-15.0 . I have recived follow message when I call pjsua_acc_del : SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP ?????? ?:5060;branch=z9hG4bKPjce54c4d9cbc3464a9c2480c0b73 6a277;received=192.168.40.247;rport=5060 From: <sip:8077@192.168.10.116>;tag=0433156bce324b899a9551091c6da188 To: <sip:8077 at 192.168.10.116>;tag=as698fbc8c Call-ID: b1469b99ad024db9b7829c913cb009c7 CSeq: 41115 REGISTER Server: Asterisk PBX 1.8.13.0-rc1 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLIS H Supported: replaces, timer WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="32bbf148" Content-Length: 0 2012-09-03 _____ ligen -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120903/a11b1370/attachment-0001.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.png Type: image/png Size: 168 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120903/a11b1370/attachment-0001.png> -------------- next part -------------- A non-text attachment was scrubbed... Name: image002.jpg Type: image/jpeg Size: 2038 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120903/a11b1370/attachment-0001.jpg>