[Kamailio-Users] Loadbalancer/outbound_proxy and ACK problem

Hello list, let me first show my scenario: UAC_A ---> LB ---> | | PROXY+REG #1 | or | PROXY+REG #2 UAC_B <--- LB <--- | LB cfg: modparam("path", "use_received", 1) loose_route(); #for REG+PROXY if(is_method("REGISTER")){ add_path_received(); ds_select_dst("1", "0"); fix_nated_register(); } else { record_route(); add_path(); ds_select_dst("1", "0"); fix_nated_register(); } PROXY+REG cfg: ------------- modparam("registrar", "use_path", 1) modparam("registrar", "path_mode", 0) modparam("registrar", "path_use_received", 1) INVITE if working fine until ACK. UAC_A sends ACK to LB "ACK sip:UAC_B@LB_IP:5678;" insted of "ACK sip:UAC_B@UAC_B_PUB_IP:". In "200 OK" which PROXY sends to LB Contact is rewritten with ip addres of LB "Contact: <sip:UAC_B@LB_IP:5678;" and this is why UAC_A sends wrong ACK. Obviously I miss something so if someone could point me where to look. Thanks Pavel U UAC_A_PUB_IP:31488 -> LB_IP:5678 INVITE sip:UAC_B@test.com SIP/2.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport..Max-Forwards: 70..Contact: <sip:UAC_A@UAC_A_PRIV_IP:31488>..To: "UAC_B"<sip:UAC_B@test.com>..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID:ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE.. # U LB_IP:5678 -> UAC_A_PUB_IP:31488 SIP/2.0 100 Giving a try..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488;received=UACs_PUB_IP..To: "UAC_B"<sip:UAC_B@test.com>..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..Server: Kamailio (1.5.1-tls (x86_64/linux))..Content-Length: 0.... # U LB_IP:5678 -> REG_PROXY_IP:5166 INVITE sip:UAC_B@test.com SIP/2.0..Record-Route: <sip:LB_IP:5678;lr=on>..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Max-Forwards: 69..Contact: <sip:UAC_A@UAC_A_PUB_IP:31488>..To: "UAC_B"<sip:UAC_B@test.com>..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..Path: <sip:LB_IP:5678;lr>.... # U REG_PROXY_IP:5166 -> LB_IP:5678 SIP/2.0 100 Giving a try..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..To: "UAC_B"<sip:UAC_B@test.com>..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..Server: Kamailio (1.5.1-tls (x86_64/linux))..Content-Length: 0.... # U REG_PROXY_IP:5166 -> LB_IP:5678 INVITE sip:UAC_B@UAC_B_PRIV_IP:31468;rinstance=ed47096f240b6b6d SIP/2.0..Record-Route: <sip:REG_PROXY_IP:5166;lr=on;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Via: SIP/2.0/UDP REG_PROXY_IP:5166;branch=z9hG4bKa1b1.c7ca19a7.0..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Route: <sip:LB_IP:5678;lr;received="sip:UAC_B_PUB_IP:31468">..Max-Forwards: 68..Contact: <sip:UAC_A@UAC_A_PUB_IP:31488>..To: "UAC_B"<sip:UAC_B@test.com>..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..Path: <sip:LB_IP:5678;lr>.... # U LB_IP:5678 -> REG_PROXY_IP:5166 SIP/2.0 100 Giving a try..Via: SIP/2.0/UDP REG_PROXY_IP:5166;branch=z9hG4bKa1b1.c7ca19a7.0;rport=5166;received=REG_PROXY_IP..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..To: "UAC_B"<sip:UAC_B@test.com>..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..Server: Kamailio (1.5.1-tls (x86_64/linux))..Content-Length: 0.... # U LB_IP:5678 -> UAC_B_PUB_IP:31468 INVITE sip:UAC_B@UAC_B_PRIV_IP:31468;rinstance=ed47096f240b6b6d SIP/2.0..Record-Route: <sip:REG_PROXY_IP:5166;lr=on;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.56778065.0..Via: SIP/2.0/UDP REG_PROXY_IP:5166;rport=5166;received=REG_PROXY_IP;branch=z9hG4bKa1b1.c7ca19a7.0..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Max-Forwards: 67..Contact: <sip:UAC_A@UAC_A_PUB_IP:31488>..To: "UAC_B"<sip:UAC_B@test.com>..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..Path: <sip:LB_IP:5678;lr>.... # U UAC_B_PUB_IP:31468 -> LB_IP:5678 SIP/2.0 180 Ringing..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.56778065.0..Via: SIP/2.0/UDP REG_PROXY_IP:5166;rport =5166;received=REG_PROXY_IP;branch=z9hG4bKa1b1.c7ca19a7.0..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Contact: <sip:UAC_B@UAC_B_PRIV_IP:31 468;rinstance=ed47096f240b6b6d>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41.. Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..User-Agent: X-Lite release 1100l stamp 47546..Content-Length: 0.... # U LB_IP:5678 -> REG_PROXY_IP:5166 SIP/2.0 180 Ringing..Via: SIP/2.0/UDP REG_PROXY_IP:5166;rport=5166;received=REG_PROXY_IP;branch=z9hG4bKa1b1.c7ca19a7.0..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip: LB_IP:5678;lr=on>..Contact:<sip:UAC_B@UAC_B_PRIV_IP:31468;rinstance=ed47096f240b6b6d>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From:"UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..User-Agent: X-Lite release 1100l stamp 47546..Content-Length: 0.... # U REG_PROXY_IP:5166 -> LB_IP:5678 SIP/2.0 180 Ringing..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Contact: <sip:UAC_B@LB_IP:5678;rinstance=ed47096f240b6b6d>..To:"UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..User-Agent: X-Lite release 1100l stamp 47546..Content-Length: 0.... # U LB_IP:5678 -> UAC_A_PUB_IP:31488 SIP/2.0 180 Ringing..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Contact: <sip:UAC_B@LB_IP:5678;rinstance=ed47096f240b6b6d>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From:"UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE..User-Agent: X-Lite release 1100l stamp 47546..Content-Length: 0.... # U UAC_B_PUB_IP:31468 -> LB_IP:5678 SIP/2.0 200 OK..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.56778065.0..Via: SIP/2.0/UDP REG_PROXY_IP:5166;rport=5166;received=REG_PROXY_IP;branch=z9hG4bKa1b1.c7ca19a7.0..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Contact: <sip:UAC_B@UAC_B_PRIV_IP:31468;r instance=ed47096f240b6b6d>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE.. # U LB_IP:5678 -> REG_PROXY_IP:5166 SIP/2.0 200 OK..Via: SIP/2.0/UDP REG_PROXY_IP:5166;rport=5166;received=REG_PROXY_IP;branch=z9hG4bKa1b1.c7ca19a7.0..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Contact:<sip:UAC_B@UAC_B_PRIV_IP:31468;rinstance=ed47096f240b6b6d>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE.. # U REG_PROXY_IP:5166 -> LB_IP:5678 SIP/2.0 200 OK..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Contact: <sip:UAC_B@LB_IP:5678;rinstance=ed47096f240b6b6d>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From:"UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE.. # U LB_IP:5678 -> UAC_A_PUB_IP:31488 SIP/2.0 200 OK..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-d33a97176d49f84b-1---d8754z-;rport=31488..Record-Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Record-Route: <sip:LB_IP:5678;lr=on>..Contact: <sip:UAC_B@LB_IP:5678;rinstance=ed47096f240b6b6d>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From: "UAC_A"<sip:UAC_A@test.com >;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 INVITE.. # U UAC_A_PUB_IP:31488 -> LB_IP:5678 ACK sip:UAC_B@LB_IP:5678;rinstance=ed47096f240b6b6d SIP/2.0..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;branch=z9hG4bK-d8754z-0472a03b5d1aa106-1---d8754z-;rport..Max-Forwards: 70..Route: <sip:LB_IP:5678;lr>..Route: <sip:REG_PROXY_IP:5166;lr;nat=yes>..Contact: <sip:UAC_A@UAC_A_PRIV_IP:31488>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From: "UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 ACK.. # U LB_IP:5678 -> REG_PROXY_IP:5166 ACK sip:REG_PROXY_IP:5166;lr;nat=yes SIP/2.0..Via: SIP/2.0/UDP LB_IP:5678;branch=z9hG4bKa1b1.46778065.2..Via: SIP/2.0/UDP LB_IP:5678;rport=5678;received=LB_IP;branch=z9hG4bKa1b1.46778065.2..Via: SIP/2.0/UDP UAC_A_PRIV_IP:31488;received=UACs_PUB_IP;branch=z9hG4bK-d8754z-0472a03b5d1aa106-1---d8754z-;rport=31488..Max-Forwards: 68..Contact: <sip:UAC_A@UAC_A_PUB_IP:31488>..To: "UAC_B"<sip:UAC_B@test.com>;tag=2e79423e..From:"UAC_A"<sip:UAC_A@test.com>;tag=8c3b5c41..Call-ID: ZTliZWQ4 YTM5MjVkYjUxYTk3MmUxZmVhOGY5MzlmM2Q...CSeq: 2 ACK..