akabihno created an issue (kamailio/kamailio#4354)
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### Description
#### Scenario
Running kamailio 6.0.2 with rtpengine module.
At some point rtpengine with address 10.1.2.3 becomes temporary unavailable,
due to network failure:
ERROR: {1 2 BYE f861be32-c8a2-4d59-bb26-e2c6fe4f8dbc} rtpengine
[rtpengine.c:4038]: send_rtpp_command(): timeout waiting reply for command
"delete" from RTPEngine <udp:10.1.2.3:22222>
After rtpengine with address 10.1.2.3 becomes available again, executing
```kamcmd rtpengine.show udp:10.1.2.3:22222``` shows that **active** for it is
still **0** for indefinite time
{
url: udp:10.1.2.3:22222
set: 1
index: 10
weight: 999999
disabled: 0
active: 0
recheck_ticks: 0
}
No new calls are sent to inactive rtpengine
### Troubleshooting
#### Reproduction
Issue can be reproduced as follows:
1. Stop rtpengine.service on 10.1.2.3
2. Wait for message "ERROR: rtpengine [rtpengine.c:4003]: send_rtpp_command():
can't send command "ping" to RTPEngine <udp:10.1.2.3:22222> (Connection
refused:111)"
3. Start rtpengine.service on 10.1.2.3
4. Execute ```kamcmd rtpengine.show udp:10.1.2.3:22222``` to check that
**active** will remain **0** indefinitely
Issue reproduces on kamailio 6.0.2 and not reproducing on kamailio 5.7.1
#### Debugging Data
#### Log Messages
```
ERROR: {1 2 BYE f861be32-c8a2-4d59-bb26-e2c6fe4f8dbc} rtpengine
[rtpengine.c:4038]: send_rtpp_command(): timeout waiting reply for command
"delete" from RTPEngine <udp:10.1.2.3:22222>
```
### Possible Solutions
#### Workaround
After executing ```kamcmd rtpengine.ping udp:10.1.2.3:22222``` **active** is
set to **1**
### Additional Information
* **Kamailio Version** - output of `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: unknown
compiled on 18:13:11 Jun 25 2025 with gcc 14.2.0
```
* **Operating System**:
```
Running ghcr.io/kamailio/kamailio-ci:6.0.2-alpine in docker as systemd service
Host system:
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial
uname -a
Linux ap07prvp.dyninno.net 4.4.0-1052-aws #61-Ubuntu SMP Mon Feb 12 23:05:58
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
docker -v
Docker version 18.06.3-ce, build d7080c1
```
* **rtpengine module config parameters**:
```
modparam("rtpengine", "db_url", DBURL)
modparam("rtpengine", "extra_id_pv", "$avp(extra_id)")
modparam("rtpengine", "setid_avp", "$avp(setid)")
modparam("rtpengine", "rtpengine_disable_tout", 10)
modparam("rtpengine", "aggressive_redetection", 0)
modparam("rtpengine", "rtpengine_allow_op", 2)
modparam("rtpengine", "hash_algo", 2)
```
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