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