IgorrG created an issue (kamailio/kamailio#4268)
### Description
We use RPC dlg.end_dlg command to terminate dialog. In most cases it does
operate properly and send BYE from kamailio to both sides of dialog (as show on
screenshot).
We found that in some cases we have only first BYE sent to calling party.
Second BYE never sent, when called party tries to terminate call by timeout it
get responded with 481.
In logs we have such warning:
мая 27 15:11:46 service-proxy.iqtek.ru kamailio[3518388]: 2(3518388) WARNING:
{1 1 BYE 541d3f2c-43fd-43b6-af24-bad1fbf85eb6} dialog [dlg_handlers.c:1343]:
dlg_onroute(): unable to find dialog for BYE with route param 'e1e.4f22'
[3614:8948] and call-id '541d3f2c-43fd-43b6-af24-bad1fbf85eb6'
We also found that in this case this warning shown in logs 0.04 seconds after
kamailio receive 200ok.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
# ./kamailio -V
version: kamailio 5.8.6 (x86_64/linux) fb71db
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: fb71db
compiled on 17:38:27 May 26 2025 with gcc 12.2.0
```
* **Operating System**:
```
# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm
# uname -a
Linux rtp-kamailio2 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1
(2025-03-06) x86_64 GNU/Linux
```
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https://github.com/kamailio/kamailio/issues/4268
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