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:

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

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