[SR-Users] Dialogue restore after initial processing
Joao Alves
Jalves at amdocs.com
Fri Jul 17 16:05:58 CEST 2015
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 at 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 at decasa.website SIP/2.0
Via: SIP/2.0/WS df7jal23ls0d.invalid;branch=z9hG4bK22JccDrfSPOxK4PO4J70;rport
From: "alice"<sip:1000 at decasa.website>;tag=nZ1iB1bCyfLr3n1RWpff
To: <sip:1001 at decasa.website>;tag=a6a1c5f60faecf035a1ae5b6e96e979a-8c08
Contact: "alice"<sip:1000 at 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 at 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 at decasa.website>
To: <sip:1000 at 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 at decasa.website>
To: <sip:1000 at 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: 'miconda at gmail.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 at 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 at decasa.website><sip:1001 at decasa.website>;tag=a6a1c5f60faecf035a1ae5b6e96e979a-f6a3
From: "1000"<sip:1000 at decasa.website><sip:1000 at 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
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