pwakano created an issue (kamailio/kamailio#4404)
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### Description
Dialog timeout is not sending the BYE to the callee in case of the caller is a
webrtc client and the websocket was closed.
When the dialog times out, it is expected that the BYE is sent to both sides
even if it fails for one of them.
<!--
Explain what you did, what you expected to happen, and what actually happened.
-->
### Troubleshooting
#### Reproduction
<!--
If the issue can be reproduced, describe how it can be done.
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My scenario is:
- Have modparam("dialog", "send_bye", 1) in the config
- webrtc client makes a call to a UDP destination via Kamailio
- the websocket is closed (can be done by closing the browser tab)
- this situation is captured with an event_route[websocket:closed] where I
retrieve the dialog details and call the dlg_set_timeout("1",
"$(var(h_entry}{s.int})", "$(var(h_id)}{s.int})") to terminate the UDP side of
the call
- after the timeout, the BYE to the caller fails because it can't resolve the
invalid webrtc domain, and then the BYE to the callee is not sent
#### Log Messages
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Check the syslog file and if there are relevant log messages printed by
Kamailio, add them next, or attach to issue, or provide a link to download them
(e.g., to a pastebin site).
-->
```
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_req_within.c:432]:
send_bye(): sending BYE to caller
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> tm [h_table.c:584]:
tm_xdata_replace(): replace existing list in backup xd from new xd
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> tm [h_table.c:417]: build_cell():
created new cell 0x7f710bed06d0
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> tm [h_table.c:572]:
tm_xdata_replace(): restore X/AVP msg context from backup data
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> tm [uac.c:520]: t_uac_prepare():
next_hop=<sip:[email protected];transport=wss;ob>
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> <core> [core/resolve.c:1282]:
srv_sip_resolvehost(): mywebrtc.invalid:0 proto=0
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> <core> [core/resolve.c:795]:
get_record(): lookup(_sip._udp.mywebrtc.invalid, 33) failed
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> <core> [core/resolve.c:1386]:
srv_sip_resolvehost(): no SRV record found for mywebrtc.invalid, trying
'normal' lookup...
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> <core> [core/resolve.c:1399]:
srv_sip_resolvehost(): returning (nil) (mywebrtc.invalid:5060 proto=1)
/usr/sbin/kamailio[494381]: ERROR: <<null>:0> <core> [core/resolve.c:1773]:
sip_hostport2su(): could not resolve hostname: "mywebrtc.invalid"
/usr/sbin/kamailio[494381]: ERROR: <<null>:0> tm [ut.h:302]: uri2dst2(): failed
to resolve "mywebrtc.invalid"
/usr/sbin/kamailio[494381]: ERROR: <<null>:0> tm [uac.c:546]: t_uac_prepare():
no socket found
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> tm [h_table.c:135]:
free_cell_helper(): freeing transaction 0x7f710bed06d0 from uac.c:697
/usr/sbin/kamailio[494381]: ERROR: <<null>:0> dialog [dlg_req_within.c:459]:
send_bye(): failed to send the BYE request
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_hash.c:1090]:
dlg_unref_helper(): unref op on 0x7f710be71730 with 1 from dlg_handlers.c:1657
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_hash.c:1094]:
dlg_unref_helper(): unref dlg 0x7f710be71730 with 1 -> 1
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_hash.c:1090]:
dlg_unref_helper(): unref op on 0x7f710be71730 with 1 from dlg_handlers.c:1660
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_hash.c:1094]:
dlg_unref_helper(): unref dlg 0x7f710be71730 with 1 -> 0
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_hash.c:1094]:
dlg_unref_helper(): ref <=0 for dialog 0x7f710be71730
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_hash.c:344]:
destroy_dlg(): destroying dialog 0x7f710be71730 (ref 0)
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_hash.c:354]:
destroy_dlg(): removed timer for dlg 0x7f710be71730 [2636:74773] with clid
'm2b01mn4kk83esl50dm7' and tags 'r92mn5lkgl' 'as11e71a25'
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_cb.c:269]:
run_dlg_callbacks(): dialog=0x7f710be71730, type=8192
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> acc [acc_cdr.c:712]:
cdr_on_destroy(): dialog '0x7f710be71730' destroyed!
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_dmq.c:488]:
dlg_dmq_replicate_action(): replicating action [3] on [2636:74773] to dmq peers
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_dmq.c:644]:
dlg_dmq_replicate_action(): sending serialized data
{"action":3,"h_entry":2636,"h_id":74773,"state":4}
/usr/sbin/kamailio[494381]: DEBUG: <<null>:0> dialog [dlg_dmq.c:88]:
dlg_dmq_send(): sending dmq broadcast...
```
### Possible Cause
Seems related with https://github.com/kamailio/kamailio/issues/4169
### Additional Information
This issue didn't happen in the 5.8 version
* **Kamailio Version** - output of `kamailio -v`
```
# kamailio -v
version: kamailio 6.0.2 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC,
F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES,
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE
262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id:
compiled on 00:00:00 Sep 13 2022 with gcc 11.5.0
```
* **Operating System**:
<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu
16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
-->
```
# cat /etc/os-release
NAME="Oracle Linux Server"
VERSION="9.6"
ID="ol"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="9.6"
PLATFORM_ID="platform:el9"
PRETTY_NAME="Oracle Linux Server 9.6"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:9:6:server"
HOME_URL="https://linux.oracle.com/";
BUG_REPORT_URL="https://github.com/oracle/oracle-linux";
ORACLE_BUGZILLA_PRODUCT="Oracle Linux 9"
ORACLE_BUGZILLA_PRODUCT_VERSION=9.6
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=9.6
# uname -a
Linux dev-sbc-03 5.14.0-503.38.1.el9_5.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Apr 16
14:45:31 PDT 2025 x86_64 x86_64 x86_64 GNU/Linux
```
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