Re: [SR-Users] Dialogue restore after initial processing

Hi Daniel, Following up on this, I continued doing further tests... So I confirmed that the to-tag value is in fact added to the $tt only after the SIP ACK is received. So I was able to temporarily stored them (just for the sake of pursuing tests...) as: $shv(ftag)=$ft; $shv(ttag)=$tt; When later I get the HTTP (w/ a call release event), I noticed that the $tt is not available anymore - only since I kept on a shared variable I was able to restore the dialogue. Below find a extract of the config file being used. if(is_known_dlg()) { xlog("Request $rm from $ci is in-dialog\n"); xlog("From tag is $ft and To tag is $tt\n"); } xlog("L_DBG","From-tag is $shv(ftag) and To-tag $shv(ttag)\n\n"); if(dlg_get("$var(call_id)", "$shv(ftag)", "$shv(ttag)")) { xlog("L_DBG","Dialogue was restored\n\n"); } dlg_bye("caller"); and the respective log. 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1313 a=24 n=is_known_dlg 14(14527) DEBUG: dialog [dlg_hash.c:697]: internal_get_dlg(): ref dlg 0x7f6896bd35f0 with 1 -> 3 14(14527) DEBUG: dialog [dlg_hash.c:700]: internal_get_dlg(): dialog callid='a03faa7f-a6a6-fa6f-549d-d7e9c308f5ea' found on entry 525, dir=1 14(14527) DEBUG: dialog [dlg_hash.c:858]: dlg_unref(): unref dlg 0x7f6896bd35f0 with 1 -> 2 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1314 a=25 n=xlog 14(14527) ERROR: <script>: Request INVITE from a03faa7f-a6a6-fa6f-549d-d7e9c308f5ea is in-dialog 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1315 a=25 n=xlog 14(14527) DEBUG: pv [pv_core.c:376]: pv_get_xto_attr(): no Tag parameter 14(14527) ERROR: <script>: From tag is W92rKx26QMoMWR7ZNXZo and To tag is <null> 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1318 a=26 n=xlog 14(14527) DEBUG: <script>: From-tag is W92rKx26QMoMWR7ZNXZo and To-tag a6a1c5f60faecf035a1ae5b6e96e979a-2d04 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1324 a=16 n=if 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1320 a=27 n=dlg_get 14(14527) DEBUG: dialog [dlg_hash.c:697]: internal_get_dlg(): ref dlg 0x7f6896bd35f0 with 1 -> 3 14(14527) DEBUG: dialog [dlg_hash.c:700]: internal_get_dlg(): dialog callid='a03faa7f-a6a6-fa6f-549d-d7e9c308f5ea' found on entry 525, dir=1 14(14527) DEBUG: dialog [dlg_hash.c:858]: dlg_unref(): unref dlg 0x7f6896bd35f0 with 1 -> 2 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1321 a=26 n=xlog 14(14527) DEBUG: <script>: Dialogue was restored 14(14527) exec: *** cfgtrace:request_route=[MATRIX_LONG_PULL] c=[/etc/kamailio/kamailio.cfg] l=1324 a=25 n=dlg_bye 14(14527) DEBUG: dialog [dlg_hash.c:640]: dlg_lookup(): ref dlg 0x7f6896bd35f0 with 1 -> 3 14(14527) DEBUG: dialog [dlg_hash.c:642]: dlg_lookup(): dialog id=9134 found on entry 525 14(14527) DEBUG: dialog [dlg_req_within.c:351]: send_bye(): sending BYE to caller 14(14527) DEBUG: tm [uac.c:249]: t_uac_prepare(): DEBUG:tm:t_uac: next_hop=<sip:1000@188.165.231.30:12060;rtcweb-breaker=no;click2call=no;transport=udp;ws-src-ip=85.138.200.8;ws-src-port=50245;ws-src-proto=ws> 14(14527) DEBUG: tm [uac.c:150]: dlg2hash(): DEBUG: dlg2hash: 8772 14(14527) DEBUG: dialog [dlg_req_within.c:384]: send_bye(): BYE sent to caller When checking the received SIP BYE (on the client side - using sipML5 as a client) I was able to see that the To and From fields were sent inverted, which caused a 482 Loop detected response, as can be seen from the logs extracted from the java console. SEND: ACK sip:1001@decasa.website SIP/2.0 Via: SIP/2.0/WS df7jal23ls0d.invalid;branch=z9hG4bK22JccDrfSPOxK4PO4J70;rport From: "alice"<sip:1000@decasa.website>;tag=nZ1iB1bCyfLr3n1RWpff To: <sip:1001@decasa.website>;tag=a6a1c5f60faecf035a1ae5b6e96e979a-8c08 Contact: "alice"<sip:1000@df7jal23ls0d.invalid;rtcweb-breaker=no;click2call=no;transport=ws>;+g.oma.sip-im;language="en,fr" Call-ID: adec7d16-c08a-950f-2b09-db388e20b90b CSeq: 27168 ACK Content-Length: 0 Route: <sip:decasa.website:5060;lr;sipml5-outbound;transport=udp> Max-Forwards: 70 User-Agent: IM-client/OMA1.0 sipML5-v1.2015.03.18 recv=BYE sip:1000@188.165.231.30:14060;rtcweb-breaker=no;click2call=no;transport=ws;ws-src-ip=85.138.200.8;ws-src-port=50129;ws-src-proto=ws SIP/2.0 Via: SIP/2.0/UDP 151.236.52.84;branch=z9hG4bK84d6.49978fe6000000000000000000000000.0 From: <sip:1001@decasa.website> To: <sip:1000@decasa.website>;tag=nZ1iB1bCyfLr3n1RWpff Call-ID: adec7d16-c08a-950f-2b09-db388e20b90b CSeq: 1 BYE Content-Length: 0 User-Agent: kamailio (4.3.0 (x86_64/linux)) Max-Forwards: 70 SEND: SIP/2.0 482 Loop Detected (Check your iFCs) Via: SIP/2.0/UDP 151.236.52.84;branch=z9hG4bK84d6.49978fe6000000000000000000000000.0 From: <sip:1001@decasa.website> To: <sip:1000@decasa.website>;tag=nZ1iB1bCyfLr3n1RWpff Call-ID: adec7d16-c08a-950f-2b09-db388e20b90b CSeq: 1 BYE Content-Length: 0 If you require further info to track down the problem let me know. Many Thanks, Joao From: Joao Alves Sent: sexta-feira, 17 de Julho de 2015 12:07 To: &#39;miconda(a)gmail.com&#39;com'; Kamailio (SER) - Users Mailing List Subject: RE: [SR-Users] Dialogue restore after initial processing Hi Daniel, If I remember correctly the To-tag would be needed prior to 200 OK do to "early dialogs". Which in a way is supported by the 180 Ringing where the To-tag was self-generated by kamailio when building the response. So I was not sure was a "bug" not updating the $tt accordingly or, whether there would be a need for a new function dlg_get_early(callid, ftag) as you suggested. But both would work for me. If this could be done, appreciated:) Many Thanks, Joao From: Daniel-Constantin Mierla [mailto:miconda@gmail.com] Sent: quinta-feira, 16 de Julho de 2015 10:38 To: Kamailio (SER) - Users Mailing List; Joao Alves Subject: Re: [SR-Users] Dialogue restore after initial processing Hello, iirc, the to-tag is set in the dialog structure when the 200ok is processed. During the call setup, there can be many outgoing branches, therefore many 'early' to-tags, but only one will be final, once the call is answered. On the other hand, there is a C function that returns the local generated To-tag. It is in sl module, named get_reply_totag(...). It is not available in the config file, not being needed so far. Anyhow, in your case, might be better to add a function dlg_get_early(callid, ftag), because to-tag of the dialog is not really known at that moment. Cheers, Daniel On 14/07/15 17:14, Joao Alves wrote: Hi, I'm trying to restore a SIP session dialogue context and found dlg_get(callid, ftag, ttag) function for that. However, I cannot access the To tag. I noticed on the 180 RINGING there was already an self-generated included on this response, but I also could not access its value. When receiving the SIP INVITE request I used the dlg_manage() and the context was initially stored. if(is_known_dlg()) { xlog("Request $rm from $ci is in-dialog\n"); xlog(">>From tag is $ft and To tag is $tt\n"); # Needed to later restore the dialog $shv(ftag)=$ft; $shv(ttag)=$tt; } 15(49100) ERROR: <script>: Request INVITE from 76589ZWQ5NzIyYjMzNDI1YjVjM2E5ZWU5NjhkYzEyNjE3MzQ is in-dialog 15(49100) exec: *** cfgtrace:request_route=[MATRIX] c=[/etc/kamailio/kamailio.cfg] l=1021 a=25 n=xlog 15(49100) DEBUG: pv [pv_core.c:376]: pv_get_xto_attr(): no Tag parameter 15(49100) ERROR: <script>: >>From tag is 8fd06474 and To tag is <null> Since there was a self-generated one (after the 180 RINGING being sent), I rechecked the $tt and $dlg(to_tag) values and both still returned null values. 15(49100) DEBUG: tm [t_lookup.c:1083]: t_check_msg(): DEBUG: t_check_msg: T already found! 15(49100) DEBUG: <core> [tcp_main.c:2196]: tcpconn_send_put(): send from reader (49100 (15)), reusing fd 15(49100) DEBUG: <core> [tcp_main.c:2430]: tcpconn_do_send(): sending... 15(49100) DEBUG: <core> [tcp_main.c:2464]: tcpconn_do_send(): after real write: c= 0x7effdf7da860 n=396 fd=5 15(49100) DEBUG: <core> [tcp_main.c:2465]: tcpconn_do_send(): buf= SIP/2.0 180 ringing Via: SIP/2.0/TCP 192.168.1.5:58751;branch=z9hG4bK-524287-1---a64e0a42199ee419;rport=61134;received=85.138.200.8 To: <sip:1001@decasa.website><sip:1001@decasa.website>;tag=a6a1c5f60faecf035a1ae5b6e96e979a-f6a3 From: "1000"<sip:1000@decasa.website><sip:1000@decasa.website>;tag=8fd06474 Call-ID: 76589ZWQ5NzIyYjMzNDI1YjVjM2E5ZWU5NjhkYzEyNjE3MzQ CSeq: 1 INVITE Server: kamailio (4.3.0 (x86_64/linux)) Content-Length: 0 ..., shmem=0x7effdf7e1e00: SIP/2.0 180 ringingght(): DEBUG: reply sent out. buf=0x7effec023bf8: SIP/2.0 180 ringing 15(49100) DEBUG: tm [t_reply.c:657]: _reply_light(): DEBUG: _reply_light: finished 15(49100) DEBUG: sl [sl.c:272]: send_reply(): reply in stateful mode (tm) 15(49100) exec: *** cfgtrace:request_route=[MATRIX] c=[/etc/kamailio/kamailio.cfg] l=1031 a=25 n=xlog 15(49100) DEBUG: dialog [dlg_hash.c:640]: dlg_lookup(): ref dlg 0x7effdf7e1bf0 with 1 -> 2 15(49100) DEBUG: dialog [dlg_hash.c:642]: dlg_lookup(): dialog id=5769 found on entry 128 15(49100) DEBUG: dialog [dlg_hash.c:858]: dlg_unref(): unref dlg 0x7effdf7e1bf0 with 1 -> 1 15(49100) ERROR: <script>: Dialog To Tag: <null> <== xlog("Dialog To Tag: $dlg(to_tag)\n"); 15(49100) exec: *** cfgtrace:request_route=[MATRIX] c=[/etc/kamailio/kamailio.cfg] l=1033 a=25 n=xlog 15(49100) DEBUG: pv [pv_core.c:376]: pv_get_xto_attr(): no Tag parameter 15(49100) ERROR: <script>: >>From2 tag is 8fd06474 and To tag is <null> Many thanks, Joao Alves Solution Architect, Unified Communications This message and the information contained herein is proprietary and confidential and subject to the Amdocs policy statement, you may review at http://www.amdocs.com/email_disclaimer.asp _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org<mailto:sr-users@lists.sip-router.org> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users -- Daniel-Constantin Mierla http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda Book: SIP Routing With Kamailio - http://www.asipto.com