Hi, I couldn't register PJSUA with IMS. The SIP REGISTER lacks an authentication header. Am I missing an config parameter when running the PJSUA? I already have config_site.h set. I checked the mailing list archive for possible solution but it was futile. :::::::::::MY CONFIG_SITE.H FILE:::::::::: #define PJSIP_HAS_TLS_TRANSPORT 1 #define PJSIP_HAS_DIGEST_AKA_AUTH 1 ::::::::::ERROR MESSAGE FROM P-CSCF:::::::::: 1(16685) DBG:P-CSCF:P_remove_header_tag(): Original <Require> -> <path> 1(16685) DBG:P-CSCF:P_verify_security: Looking for <1://127.0.0.1:4060> 1(16685) ERR:P-CSCF:cscf_get_authorization: Message does not contain Authorization header. 1(16685) INF:P-CSCF:P_add_integrity_protected: No authorization header found. ::::::::::RUNNING PJSUA::::::::::::: micadeyeye at micadeyeye-desktop:/opt/pjproject-0.8.0/pjsip-apps/bin$ ./pjsua-i686-pc-linux-gnu --registrar sip:open-ims.test --id sip:alice at open-ims.test --username alice at open-ims.test --password alice --local-port 5066 --realm open-ims.test --proxy sip:pcscf.open-ims.test:4060;lr --use-ims ::::::PJSUA LOG:::::::::::::: 00:20:35.000 pjsua_core.c 1 SIP worker threads created 00:20:35.000 pjsua_core.c pjsua version 0.8.0 for i686-pc-linux-gnu initialized 00:20:35.001 pjsua_core.c SIP UDP socket reachable at 169.254.10.219:5066 00:20:35.001 udp0x81dc904 SIP UDP transport started, published address is 169.254.10.219:5066 00:20:35.001 pjsua_acc.c Account <sip:169.254.10.219:5066;transport=UDP> added with id 0 00:20:35.002 tcplis:5066 SIP TCP listener ready for incoming connections at 169.254.10.219:5066 00:20:35.002 pjsua_acc.c Account <sip:169.254.10.219:5066;transport=TCP> added with id 1 00:20:35.002 pjsua_acc.c Account sip:alice at open-ims.test added with id 2 00:20:35.053 pjsua_core.c TX 452 bytes Request msg REGISTER/cseq=64678 (tdta0x81e1480) to UDP 127.0.0.1:4060: REGISTER sip:pcscf.open-ims.test:4060 SIP/2.0 Via: SIP/2.0/UDP 169.254.10.219:5066;rport;branch=z9hG4bKPj49770000000367458b6b Max-Forwards: 70 From: <sip:alice@xxxxxxxxxxxxx>;tag=49770000000267458b6b To: <sip:alice at open-ims.test> Call-ID: 49770000000167458b6b CSeq: 64678 REGISTER User-Agent: PJSUA v0.8.0/i686-pc-linux-gnu Contact: <sip:alice at 169.254.10.219:5066;transport=UDP> Expires: 300 Route: <sip:open-ims.test> Content-Length: 0 --end msg-- 00:20:35.053 pjsua_acc.c Registration sent REGISTER sip:pcscf.open-ims.test:4060 SIP/2.0 Via: SIP/2.0/UDP 169.254.10.219:5066;rport;branch=z9hG4bKPj49770000000367458b6b Max-Forwards: 70 From: <sip:alice@xxxxxxxxxxxxx>;tag=49770000000267458b6b To: <sip:alice at open-ims.test> Call-ID: 49770000000167458b6b CSeq: 64678 REGISTER User-Agent: PJSUA v0.8.0/i686-pc-linux-gnu Contact: <sip:alice at 169.254.10.219:5066;transport=UDP> Expires: 300 Route: <sip:open-ims.test> Content-Length: 0 --end msg-- 00:20:36.554 pjsua_core.c TX 452 bytes Request msg REGISTER/cseq=64678 (tdta0x81e1480) to UDP 127.0.0.1:4060: REGISTER sip:pcscf.open-ims.test:4060 SIP/2.0 Via: SIP/2.0/UDP 169.254.10.219:5066;rport;branch=z9hG4bKPj49770000000367458b6b Max-Forwards: 70 From: <sip:alice@xxxxxxxxxxxxx>;tag=49770000000267458b6b To: <sip:alice at open-ims.test> Call-ID: 49770000000167458b6b CSeq: 64678 REGISTER User-Agent: PJSUA v0.8.0/i686-pc-linux-gnu Contact: <sip:alice at 169.254.10.219:5066;transport=UDP> Expires: 300 Route: <sip:open-ims.test> Content-Length: 0 --end msg-- 00:20:38.560 pjsua_core.c TX 452 bytes Request msg REGISTER/cseq=64678 (tdta0x81e1480) to UDP 127.0.0.1:4060: REGISTER sip:pcscf.open-ims.test:4060 SIP/2.0 Via: SIP/2.0/UDP 169.254.10.219:5066;rport;branch=z9hG4bKPj49770000000367458b6b Max-Forwards: 70 From: <sip:alice@xxxxxxxxxxxxx>;tag=49770000000267458b6b To: <sip:alice at open-ims.test> Call-ID: 49770000000167458b6b CSeq: 64678 REGISTER User-Agent: PJSUA v0.8.0/i686-pc-linux-gnu Contact: <sip:alice at 169.254.10.219:5066;transport=UDP> Expires: 300 Route: <sip:open-ims.test> Content-Length: 0 --end msg-- 00:21:05.026 pjsua_core.c RX 611 bytes Response msg 504/REGISTER/cseq=64678 (rdata0x81dcd14) from UDP 127.0.0.1:4060: SIP/2.0 504 Server Time-Out Via: SIP/2.0/UDP 169.254.10.219:5066;received=127.0.0.1;received=127.0.0.1;rport=5066;branch=z9hG4bKPj49770000000367458b6b From: <sip:alice@xxxxxxxxxxxxx>;tag=49770000000267458b6b To: <sip:alice at open-ims.test>;tag=f4c6194fd3f02ff08827e179165a540f-0245 Call-ID: 49770000000167458b6b CSeq: 64678 REGISTER Server: Sip EXpress router (2.1.0-dev1 OpenIMSCore (i386/linux)) Content-Length: 0 Warning: 392 127.0.0.1:4060 "Noisy feedback tells: pid=16689 req_src_ip=127.0.0.1 req_src_port=4060 in_uri=sip:pcscf.open-ims.test:4060 out_uri=sip:pcscf.open-ims.test:4060 via_cnt==0" --end msg-- 00:21:05.026 pjsua_acc.c SIP registration failed, status=504 (Server Time-Out) Thanks, Michael.