[SR-Users] Dialogue restore after initial processing

[Daniel-Constantin Mierla]

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 $dlg(to_tag) values and both still
> returned null values.
>
>  
>
> 15(49100) DEBUG: tm [t_lookup.c:1083]: t_check_msg(): DEBUG:
> t_check_msg: T already found!
>
> 15(49100) DEBUG: <core> [tcp_main.c:2196]: tcpconn_send_put(): send
> from reader (49100 (15)), reusing fd
>
> 15(49100) DEBUG: <core> [tcp_main.c:2430]: tcpconn_do_send(): sending...
>
> 15(49100) DEBUG: <core> [tcp_main.c:2464]: tcpconn_do_send(): after
> real write: c= 0x7effdf7da860 n=396 fd=5
>
> 15(49100) DEBUG: <core> [tcp_main.c:2465]: tcpconn_do_send(): buf=
>
> SIP/2.0 180 ringing
>
> Via: SIP/2.0/TCP
> 192.168.1.5:58751;branch=z9hG4bK-524287-1---a64e0a42199ee419;rport=61134;received=85.138.200.8
>
> To: <sip:1001 at decasa.website>;tag=a6a1c5f60faecf035a1ae5b6e96e979a-f6a3
>
> From: "1000"<sip:1000 at decasa.website>;tag=8fd06474
>
> Call-ID: 76589ZWQ5NzIyYjMzNDI1YjVjM2E5ZWU5NjhkYzEyNjE3MzQ
>
> CSeq: 1 INVITE
>
> Server: kamailio (4.3.0 (x86_64/linux))
>
> Content-Length: 0
>
>  
>
>  
>
> ..., shmem=0x7effdf7e1e00: SIP/2.0 180 ringingght(): DEBUG: reply sent
> out. buf=0x7effec023bf8: SIP/2.0 180 ringing
>
> 15(49100) DEBUG: tm [t_reply.c:657]: _reply_light(): DEBUG:
> _reply_light: finished
>
> 15(49100) DEBUG: sl [sl.c:272]: send_reply(): reply in stateful mode (tm)
>
> 15(49100) exec: *** cfgtrace:request_route=[MATRIX]
> c=[/etc/kamailio/kamailio.cfg] l=1031 a=25 n=xlog
>
> 15(49100) DEBUG: dialog [dlg_hash.c:640]: dlg_lookup(): ref dlg
> 0x7effdf7e1bf0 with 1 -> 2
>
> 15(49100) DEBUG: dialog [dlg_hash.c:642]: dlg_lookup(): dialog id=5769
> found on entry 128
>
> 15(49100) DEBUG: dialog [dlg_hash.c:858]: dlg_unref(): unref dlg
> 0x7effdf7e1bf0 with 1 -> 1
>
> 15(49100) ERROR: <script>: Dialog To Tag: <null>  
>                                                            
>                                     <== xlog("Dialog To
> Tag:$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
>
>  
>
>  
>
> This message and the information contained herein is proprietary and
> confidential and subject to the Amdocs policy statement, you may
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>
>
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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Book: SIP Routing With Kamailio - http://www.asipto.com

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