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: 'miconda@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, appreciatedJ

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>;tag=a6a1c5f60faecf035a1ae5b6e96e979a-f6a3

From: "1000"<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

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