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### Description
<!-- 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. -->
#### Debugging Data
<!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location.
gdb /path/to/kamailio /path/to/corefile bt full info locals list
If you are familiar with gdb, feel free to attach more of what you consider to be relevant. -->
``` I want to read params from environment, so define #!defenv MYSQL_IP #!trydef DBURL "mysql://kamailio:kamailio@MYSQL_IP/kamailio"
but It can't read this ”MYSQL_IP“。
root@d2e1fcc3f89e:/# env |grep MYSQL* MYSQL_URL=172.16.4.111 MYSQL_IP=172.16.4.111
```
#### Log Messages
<!-- 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). --> ``` 0(34) ERROR: db_mysql [km_my_con.c:166]: db_mysql_new_connection(): driver error: Unknown server host 'MYSQL_IP' (-2) 0(34) ERROR: <core> [db.c:324]: db_do_init2(): could not add connection to the pool 0(34) ERROR: dispatcher [dispatch.c:955]: ds_connect_db(): cannot initialize db connection 0(34) ERROR: dispatcher [dispatch.c:989]: ds_init_db(): unable to connect to the database 0(34) ERROR: dispatcher [dispatcher.c:439]: mod_init(): could not initiate a connect to the database 0(34) ERROR: <core> [core/sr_module.c:1030]: init_mod(): Error while initializing module dispatcher (/usr/lib/x86_64-linux-gnu/kamailio/modules/dispatcher.so)
```
#### SIP Traffic
<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->
``` (paste your sip traffic here) ```
### Possible Solutions
<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` version: kamailio 5.7.4 (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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 12.2.0
```
* **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 /proc/version Linux version 3.10.0-1160.105.1.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) ) #1 SMP Thu Dec 7 15:39:45 UTC 2023
```