sip - 481 Call Leg/Transaction Does Not Exist using SipUnit -

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i've changed sipr sipunit, , i'm trying make basic call. server has digest authentication. unfurnately, keep getting "481 call leg/transaction not exist" , i'm sure because of pretty obvious reason, can't seem solve it... i've tried everything. here critical piece pbx's logs. in advance, if can explain me why happening!

- --> sip/2.0 407 proxy authentication required -     from: <sip:6000@auto>;tag=126319630 -     to: <sip:6001@auto>;tag=2ff812a8-da5512ac-1b94-6006-5a9c94-45273d5a-5a9c94 -     call-id: e0114805d5e2e318089ce3ef710aad63@10.200.10.59 -     cseq: 1 invite -     contact: <sip:6001@172.18.85.218:1060> -     proxy-authenticate: digest realm="radvision.com",nonce="c0cf196770955ca0fc6e3e65dc0cdb410000000055c1cef4",algorithm=md5 -     via: sip/2.0/udp 10.200.10.59:9001;received=172.18.85.218;rport=1060;branch=z9hg4bk-373136-f42a6651eba8e1583353591126fdf561 -     content-length: 0    - <-- ack sip:6001@auto sip/2.0 -     call-id: e0114805d5e2e318089ce3ef710aad63@10.200.10.59 -     max-forwards: 70 -     from: <sip:6000@auto>;tag=126319630 -     to: <sip:6001@auto>;tag=2ff812a8-da5512ac-1b94-6006-5a9c94-45273d5a-5a9c94     -     via: sip/2.0/udp 10.200.10.59:9001;branch=z9hg4bk-373136-f42a6651eba8e1583353591126fdf561 -     cseq: 1 ack -     route: <sip:172.18.85.218:1060;lr;transport=udp> -     content-length: 0    - <-- invite sip:6001@auto sip/2.0 -     call-id: e0114805d5e2e318089ce3ef710aad63@10.200.10.59 -     cseq: 2 invite -     from: <sip:6000@auto>;tag=126319630 -     to: <sip:6001@auto>;tag=2ff812a8-da5512ac-1b94-6006-5a9c94-45273d5a-5a9c94 -     via: sip/2.0/udp 10.200.10.59:9001;branch=z9hg4bk-373136-a29ab2f2fc28a3f00e2cd290bac58473 -     max-forwards: 70 -     contact: <sip:6000@10.200.10.59:9001;transport=udp;lr> -     route: <sip:172.18.85.218:1060;lr;transport=udp>,<sip:172.18.85.218:1060;lr;transport=udp> -     proxy-authorization: digest username="6000",realm="radvision.com",nonce="c0cf196770955ca0fc6e3e65dc0cdb410000000055c1cef4",uri="sip:6001@auto",response="79af22055592634e57d5c17e59da166e",algorithm=md5 -     content-length: 0    - --> sip/2.0 481 call leg/transaction not exist -     from: <sip:6000@auto>;tag=126319630 -     to: <sip:6001@auto>;tag=2ff812a8-da5512ac-1b94-6006-5a9c94-45273d5a-5a9c94 -     call-id: e0114805d5e2e318089ce3ef710aad63@10.200.10.59 -     cseq: 2 invite -     via: sip/2.0/udp 10.200.10.59:9001;branch=z9hg4bk-373136-a29ab2f2fc28a3f00e2cd290bac58473 -     content-length: 0

i'm using code similar example testwithproxyauthentication.java.

in flow attached, registration not completed. after receiving "407 proxy authentication required", should send 2nd register proxy-authorization header.


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