sergey-safarov created an issue (kamailio/kamailio#4212)

### Description

When I add a new dispatcher target using the kamcmd command, then kamailio does not start send OPTIONS.

#### Reproduction Need to start Kamailio with config file ``` listen=eth0

loadmodule "xlog.so" loadmodule "pv.so" loadmodule "ctl.so" loadmodule "jsonrpcs.so"

loadmodule "dispatcher.so" modparam("dispatcher", "list_file", "/dev/null")

route{ xerr("TEST $ci\n"); drop; } ``` And then execute comands ``` kamcmd dispatcher.add 1 "sip:sip.telnyx.com:5060;transport=tcp" 8 kamcmd dispatcher.list ``` After the last command expected output ``` { NRSETS: 1 RECORDS: { SET: { ID: 1 TARGETS: { DEST: { URI: sip:sip.telnyx.com:5060;transport=tcp FLAGS: AP PRIORITY: 0 } } } } } ``` As you can see, the target has `AP` flags, which means the target is active and probing enabled. But no OPTIONS messages were sent.

#### Log Messages

Here is kamailio debug output for during kamcmd execitions and some time after

``` 12(94363) DEBUG: ctl [../../core/io_wait.h:368]: io_watch_add(): processing io_watch_add(0x7fce67ac03a0, 10, 3, 0x21186bf0) - fd_no=1 12(94363) DEBUG: ctl [io_listener.c:440]: handle_new_connect(): new connection (1) on /var/run/kamailio//kamailio_ctl 12(94363) DEBUG: ctl [io_listener.c:501]: handle_stream_read(): bytes read: 68 12(94363) DEBUG: <core> [core/dns_cache.c:533]: _dns_hash_find(): (sip.telnyx.com(14), 1), h=507 12(94363) DEBUG: <core> [core/resolve.c:1021]: get_record(): skipping 0 NS (p=0x9c6ad0, end=0x9c6ad0) 12(94363) DEBUG: <core> [core/resolve.c:1035]: get_record(): parsing 0 ARs (p=0x9c6ad0, end=0x9c6ad0) 12(94363) DEBUG: <core> [core/dns_cache.c:1699]: dns_get_related(): (0x7fce63a32000 (sip.telnyx.com, 1), 1, *(nil)) (0) 12(94363) DEBUG: <core> [core/dns_cache.c:1702]: dns_get_related(): record not alone: 0x7fce63a32000 - type: 1 12(94363) DEBUG: <core> [core/dns_cache.c:748]: dns_cache_add_unsafe(): adding sip.telnyx.com(14) 1 (flags=0) at 507 12(94363) DEBUG: dispatcher [dispatch.c:768]: add_dest2list(): dest [1/1] sip:sip.telnyx.com:5060;transport=tcp 12(94363) DEBUG: dispatcher [dispatch.c:258]: ds_log_dst_cb(): dst>> 1 sip:sip.telnyx.com:5060;transport=tcp 8 0 (,0,0,0) 12(94363) DEBUG: ctl [io_listener.c:522]: handle_stream_read(): bytes processed: 68 12(94363) DEBUG: ctl [io_listener.c:498]: handle_stream_read(): handle_stream read: eof on /var/run/kamailio//kamailio_ctl 12(94363) DEBUG: ctl [../../core/io_wait.h:599]: io_watch_del(): DBG: io_watch_del (0x7fce67ac03a0, 10, -1, 0x10) fd_no=2 called

12(94363) DEBUG: ctl [../../core/io_wait.h:368]: io_watch_add(): processing io_watch_add(0x7fce67ac03a0, 10, 3, 0x21186bf0) - fd_no=1 12(94363) DEBUG: ctl [io_listener.c:440]: handle_new_connect(): new connection (1) on /var/run/kamailio//kamailio_ctl 12(94363) DEBUG: ctl [io_listener.c:501]: handle_stream_read(): bytes read: 25 12(94363) DEBUG: ctl [io_listener.c:522]: handle_stream_read(): bytes processed: 25 12(94363) DEBUG: ctl [io_listener.c:498]: handle_stream_read(): handle_stream read: eof on /var/run/kamailio//kamailio_ctl 12(94363) DEBUG: ctl [../../core/io_wait.h:599]: io_watch_del(): DBG: io_watch_del (0x7fce67ac03a0, 10, -1, 0x10) fd_no=2 called ``` ### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 6.0.1 (x86_64/linux) fce50d 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: fce50d compiled on 00:00:00 Sep 13 2022 with gcc 14.2.1 ```

* **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`) -->

``` root@nout:~# cat /etc/os-release NAME="Fedora Linux" VERSION="41 (Workstation Edition)" RELEASE_TYPE=stable ID=fedora VERSION_ID=41 VERSION_CODENAME="" PLATFORM_ID="platform:f41" PRETTY_NAME="Fedora Linux 41 (Workstation Edition)" ANSI_COLOR="0;38;2;60;110;180" LOGO=fedora-logo-icon CPE_NAME="cpe:/o:fedoraproject:fedora:41" DEFAULT_HOSTNAME="fedora" HOME_URL="https://fedoraproject.org/" DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f41/system-administrators-guide/" SUPPORT_URL="https://ask.fedoraproject.org/" BUG_REPORT_URL="https://bugzilla.redhat.com/" REDHAT_BUGZILLA_PRODUCT="Fedora" REDHAT_BUGZILLA_PRODUCT_VERSION=41 REDHAT_SUPPORT_PRODUCT="Fedora" REDHAT_SUPPORT_PRODUCT_VERSION=41 SUPPORT_END=2025-12-15 VARIANT="Workstation Edition" VARIANT_ID=workstation ```