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