[SR-Users] Kamailio not updating CSeq after uac_auth() for ACK
George Diamantopoulos
georgediam at gmail.com
Thu Dec 17 12:20:00 CET 2020
Not sure if this is related, but I've also run into issues with
track_cseq_updates:
https://www.mail-archive.com/sr-users@lists.kamailio.org/msg12362.html
More specifically, kamailio won't process the 100 Trying to an Cseq-bumped
INVITE it generated
itself with uac_auth() when track_cseq_updates is on.
This implementation appears to be a little too fragile for the time
being....
BR,
George
On Thu, 17 Dec 2020 at 12:29, Terry Tailor <terry at fullduplex.co.uk> wrote:
> Hi, Here is setup details
> Kamailio Proxy a <-----> Kamailio Proxy b <-----> Asterisk
> Kamailio proxy b auth based on IP Kamailio Proxy a
> 1. Kamailio proxy sends an Invite request to Kamailio proxy b with CSeq:
> 102 INVITE
> 2. Kamailio proxy b check again IP auth and sends invite request to
> asterisk with CSeq: 102 INVITE
> 4 asterisk response with 401 Unauthorized with CSeq: 102
> 5. Kamailio proxy b sends ACK request with CSeq: 102 ACK
> 6. Kamailio proxy b sends INVITE request with CSeq: 103 INVITE
> 7. Asterisk sends 100 trying and 180 ringing with CSeq: 103 INVITE
> 8. Kamailio proxy b relay 180 ringing with CSeq: 102 INVITE
> 9. Asterisk send 200 Ok with CSeq: 103 INVITE and proxy b relay it to
> proxy a with CSeq: 102 INVITE
> 10. Now Proxy a send an ACK with CSeq: 102 ACK and proxy b relay ACK to
> asterisk with CSeq: 102 ACK
>
> Now asterisk is retransmitting 200 ok with CSeq: 103 INVITE and proxy a is
> sending ACK with Cseq: 102 ACK
>
> Same happing in case of 487 Request Terminated
>
> Here is my config
>
> modparam("dialog", "default_timeout", 10800) # 3h
> modparam("dialog", "dlg_match_mode", 1)
> modparam("dialog", "db_mode", 0)
> modparam("dialog", "send_bye", 1)
> modparam("dialog", "track_cseq_updates", 1)
> modparam("uac","auth_username_avp","$avp(auser)")
> modparam("uac","auth_password_avp","$avp(apass)")
> modparam("uac","auth_realm_avp","$avp(arealm)")
>
> modparam("tm", "failure_reply_mode", 3)
> # default retransmission timeout: 3 sec
> modparam("tm", "fr_timer", 2000)
> modparam("tm", "retr_timer1", 250)
> modparam("tm", "retr_timer2", 500)
> # default invite retransmission timeout after 1xx: 60 sec
> modparam("tm", "fr_inv_timer", 60000)
> modparam("tm", "reparse_on_dns_failover", 0)
>
>
>
> if (is_method("INVITE") && !has_totag()) {
> dlg_setflag(FLD_RTPPROXY);
> dlg_manage();
> }
> route(RELAY);
>
>
>
>
> route[RELAY] {
>
> # At this point all checks are passed
> t_on_branch("MANAGE_BRANCH");
> t_on_reply("MANAGE_REPLY");
> t_on_failure("MANAGE_FAILURE");
> if(is_method("INVITE") && isflagset(FLT_FROMDID)) {
> #$fd = "sip.comms.kuflink.com";
> t_on_failure("RELAY_AUTH");
> }
>
> if (!t_relay()) {
> send_reply("500", "Cannot relay to $du/$ru");
> }
> exit;
> }
>
> failure_route[RELAY_AUTH] {
> t_on_branch("MANAGE_BRANCH");
> t_on_reply("MANAGE_REPLY");
> if (t_is_canceled()) {
> exit;
> }
> if(t_check_status("401|407")) {
> #$fd = "sip.comms.kuflink.com";
> $avp(auser) = "DID_UA_USERNAME";
> $avp(apass) = "DID_UA_PASSWORD";
> if (uac_auth()) {
> t_relay();
> }
> exit;
> }
> }
>
>
> route[WITHINDLG] {
> if (!has_totag()) {
> return;
> }
>
> if (is_method("BYE")) {
> rtpengine_delete();
> }
>
> # sequential request withing a dialog should
> # take the path determined by record-routing
> if (loose_route()) {
> route(DLGURI);
> if (is_method("ACK")) {
> # ACK is forwarded statelessly
> route(NATMANAGE);
> } else if (is_method("NOTIFY")) {
> # Add Record-Route for in-dialog NOTIFY as per RFC 6665.
> record_route();
> }
> route(RELAY);
> exit;
> }
>
> if (is_method("SUBSCRIBE") && uri == myself) {
> # in-dialog subscribe requests
> route(PRESENCE);
> exit;
> }
> if (is_method("ACK") ) {
> if (t_check_trans()) {
> # no loose-route, but stateful ACK;
> # must be an ACK after a 487
> # or e.g. 404 from upstream server
> route(RELAY);
> exit;
> } else {
> # ACK without matching transaction ... ignore and discard
> exit;
> }
> }
> send_reply("404","Not here");
> exit;
> }
>
>
> kamailio -v
> version: kamailio 5.3.7 (x86_64/linux)
> flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS,
> DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC,
> F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
> USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST,
> HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
> ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024,
> BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
> id: unknown
> compiled with gcc 6.3.0
>
>
> uname -a
> Linux example.com 4.15.0-124-generic #127-Ubuntu SMP Fri Nov 6 10:54:43
> UTC 2020 x86_64 GNU/Linux
>
>
>
> SIP logs
> 2020/12/17 10:08:18.483907 proxy-a.com:5060 -> 10.0.14.118:5060
> INVITE sip:123456 at proxy-a.com SIP/2.0
> Record-Route: <sip:proxy-a.com;lr>
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>
> Contact: <sip:7654321 at did.com:5060>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> User-Agent: ProxyA
> CSeq: 102 INVITE
> User-Agent: proxy
> Date: Thu, 17 Dec 2020 10:08:18 GMT
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Remote-Party-ID: "7654321" <sip:7654321 at did.com
> >;party=calling;privacy=off;screen=no
> Content-Type: application/sdp
> Content-Length: 885
>
>
>
> 2020/12/17 10:08:18.485063 10.0.14.118:5060 -> proxy-a.com:5060
> SIP/2.0 100 trying -- your call is important to us
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1;rport=5060
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 INVITE
> Server: kamailio (5.3.7 (x86_64/linux))
> Content-Length: 0
>
>
> 2020/12/17 10:08:18.485576 10.0.14.118:5060 -> 10.0.14.118:6000
> INVITE sip:123456 at proxy-a.com SIP/2.0
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.0
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>
> Contact: <sip:7654321 at did.com:5060>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> User-Agent: ProxyA
> CSeq: 102 INVITE
> User-Agent: proxy
> Date: Thu, 17 Dec 2020 10:08:18 GMT
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Remote-Party-ID: "7654321" <sip:7654321 at did.com
> >;party=calling;privacy=off;screen=no
> Content-Type: application/sdp
> Content-Length: 885
>
>
>
> 2020/12/17 10:08:18.622867 10.0.14.118:6000 -> 10.0.14.118:5060
> SIP/2.0 401 Unauthorized
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.0;received=10.0.14.118;rport=5060
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as4107645c
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> WWW-Authenticate: Digest algorithm=MD5, realm="sip1.comms.kuflink.com",
> nonce="11139d33"
> Content-Length: 0
>
>
>
> 2020/12/17 10:08:18.624034 10.0.14.118:5060 -> 10.0.14.118:6000
> ACK sip:123456 at proxy-a.com SIP/2.0
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.0
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as4107645c
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 ACK
> Content-Length: 0
>
>
>
> 2020/12/17 10:08:18.625557 10.0.14.118:5060 -> 10.0.14.118:6000
> INVITE sip:123456 at proxy-a.com SIP/2.0
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>
> Contact: <sip:7654321 at did.com:5060>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> User-Agent: ProxyA
> CSeq: 103 INVITE
> User-Agent: proxy
> Date: Thu, 17 Dec 2020 10:08:18 GMT
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Remote-Party-ID: "7654321" <sip:7654321 at did.com
> >;party=calling;privacy=off;screen=no
> Content-Type: application/sdp
> Content-Length: 885
> Authorization: Digest username="xxxxx", realm="xxxx", nonce="11139d33",
> uri="sip:123456 at proxy-a.com", response="qwewqeqwe", algorithm=MD5
>
>
>
> 2020/12/17 10:08:18.779483 10.0.14.118:6000 -> 10.0.14.118:5060
> SIP/2.0 100 Trying
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 103 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000>
> Content-Length: 0
>
>
>
>
> 2020/12/17 10:08:20.937756 10.0.14.118:6000 -> 10.0.14.118:5060
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 103 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000>
> Content-Length: 0
>
>
>
> 2020/12/17 10:08:20.938593 10.0.14.118:5060 -> proxy-a.com:5060
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000;alias=10.0.14.118~6000~1>
> Content-Length: 0
>
>
>
> 2020/12/17 10:08:22.075814 10.0.14.118:6000 -> 10.0.14.118:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 103 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000>
> Content-Type: application/sdp
> Require: timer
> Content-Length: 296
>
>
> 2020/12/17 10:08:22.077049 10.0.14.118:5060 -> proxy-a.com:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000;alias=10.0.14.118~6000~1>
> Content-Type: application/sdp
> Require: timer
> Content-Length: 316
>
>
>
> 2020/12/17 10:08:22.103365 proxy-a.com:5060 -> 10.0.14.118:5060
> ACK sip:123456 at 10.0.14.118:6000;alias=10.0.14.118~6000~1;alias=109.72.216.251~5060~1
> SIP/2.0
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;branch=z9hG4bKbe6d.0fc1940efc770391762d7d67094c24f8.0
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK2a5fae72;rport=5060
> Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Contact: <sip:7654321 at did.com:5060>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 ACK
> User-Agent: proxy
> Content-Length: 0
>
>
>
> 2020/12/17 10:08:22.103877 10.0.14.118:5060 -> 10.0.14.118:6000
> ACK sip:123456 at 10.0.14.118:6000;alias=109.72.216.251~5060~1 SIP/2.0
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.79f351d031912aae585207d2f26d5650.0
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.0fc1940efc770391762d7d67094c24f8.0
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK2a5fae72;rport=5060
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Contact: <sip:7654321 at did.com:5060>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 ACK
> User-Agent: proxy
> Content-Length: 0
> P-K-CSeq-Refresh: 103
>
>
> 2020/12/17 10:08:22.575533 10.0.14.118:6000 -> 10.0.14.118:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 103 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000>
> Content-Type: application/sdp
> Require: timer
> Content-Length: 296
>
>
>
> 2020/12/17 10:08:22.576777 10.0.14.118:5060 -> proxy-a.com:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000;alias=10.0.14.118~6000~1>
> Content-Type: application/sdp
> Require: timer
> Content-Length: 316
>
>
>
> 2020/12/17 10:08:22.581649 proxy-a.com:5060 -> 10.0.14.118:5060
> ACK sip:123456 at 10.0.14.118:6000;alias=10.0.14.118~6000~1;alias=109.72.216.251~5060~1
> SIP/2.0
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;branch=z9hG4bKbe6d.b9c7eeccd4cd7b44f05b173308dbaf0a.0
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK219933f6;rport=5060
> Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Contact: <sip:7654321 at did.com:5060>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 ACK
> User-Agent: proxy
> Content-Length: 0
>
>
>
> 2020/12/17 10:08:22.582313 10.0.14.118:5060 -> 10.0.14.118:6000
> ACK sip:123456 at 10.0.14.118:6000;alias=109.72.216.251~5060~1 SIP/2.0
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.33626b5695ad4648ba393bc62bed6a8c.0
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.b9c7eeccd4cd7b44f05b173308dbaf0a.0
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK219933f6;rport=5060
> Max-Forwards: 70
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Contact: <sip:7654321 at did.com:5060>
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 ACK
> User-Agent: proxy
> Content-Length: 0
> P-K-CSeq-Refresh: 103
>
>
> 2020/12/17 10:08:23.575828 10.0.14.118:6000 -> 10.0.14.118:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP proxy-b.com:5060
> ;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 103 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000>
> Content-Type: application/sdp
> Require: timer
> Content-Length: 296
>
>
> 2020/12/17 10:08:23.577863 10.0.14.118:5060 -> proxy-a.com:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP proxy-a.com:5060
> ;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
> Via: SIP/2.0/UDP did.com:5060;received=did.com
> ;branch=z9hG4bK45f94ed9;rport=5060
> Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
> Record-Route: <sip:proxy-a.com;lr>
> From: "7654321" <sip:7654321 at did.com>;tag=as55c522e1
> To: <sip:123456 at proxy-a.com>;tag=as147bfa3e
> Call-ID: 67675c7e636d6e773860255316e54779 at did.com
> CSeq: 102 INVITE
> Server: proxy
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> Contact: <sip:123456 at 10.0.14.118:6000;alias=10.0.14.118~6000~1>
> Content-Type: application/sdp
> Require: timer
> Content-Length: 316
>
>
>
> _______________________________________________
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> sr-users at lists.kamailio.org
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