Hello.
I have installed open5gs v2.6.6 on ubuntu 22.04 (192.168.75.181) with kamailio and volte config as in https://open5gs.org/open5gs/docs/tutorial/02-VoLTE-setup/. It work well. I have installed osmo on 192.168.75.185 and also it work well and call establised. but when I add sgs config in mme, It show this info:
[mme] INFO: sgsap client() [192.168.75.185]:29118 (../src/mme/sgsap-sctp.c:55)
[mme] INFO: VLR-SGs[192.168.75.185] connection refused!!! (../src/mme/mme-sm.c:717)

In osmo-msc.cfg i add:
sgs
local-port 29118
local-ip 192.168.75.185
vlr-name vlr.msc001.mnc001.mcc001.3gppnetwork.org
end
and in mme.yaml:
sgsap:
addr: 192.168.75.185
map:
tai:
plmn_id:
mcc: 001
mnc: 01
tac: 1
lai:
plmn_id:
mcc: 001
mnc: 01
lac: 1
@
mme.txt

This is the log when run osmomsc
smo-msc -c /etc/osmocom/osmo-msc.cfg
DMNCC NOTICE MNCC socket at /tmp/msc_mncc (mncc_sock.c:300)
DLGLOBAL NOTICE Available via telnet 127.0.0.1 4254 (telnet_interface.c:88)
DSMPP NOTICE SMPP at 0.0.0.0 2775 (smpp_smsc.c:989)
DLCTRL NOTICE CTRL at 127.0.0.1 4255 (control_if.c:1024)
DLGSUP NOTICE GSUP connecting to 127.0.0.1:4222 (gsup_client.c:74)
DDB NOTICE Init database connection to 'sms.db' using SQLite3 lib version 3.37.2 (db.c:521)
DLMGCP NOTICE MGW(mgw) MGCP client: using endpoint domain '@mgw' (mgcp_client.c:932)
DMSC NOTICE MGW pool with 1 pool members configured, (ignoring MGW configuration in VTY node 'msc'). (msc_main.c:596)
DLSCCP NOTICE OsmoMSC-A-Iu: Using SS7 instance 0, pc:0.23.1 (sccp_user.c:566)
DLSCCP NOTICE OsmoMSC-A-Iu: Creating AS instance (sccp_user.c:573)
DLSCCP NOTICE OsmoMSC-A-Iu: Using AS instance as-clnt-OsmoMSC-A-Iu (sccp_user.c:584)
DLSCCP NOTICE OsmoMSC-A-Iu: Creating default route (sccp_user.c:590)
DLSCCP NOTICE OsmoMSC-A-Iu: No unassociated ASP for m3ua, creating new ASP asp-clnt-OsmoMSC-A-Iu (sccp_user.c:629)
DLGLOBAL ERROR Trying to dispatch event 17 to non-existent FSM instance! (osmo_ss7_as.c:118)
DLGLOBAL ERROR backtrace() returned 9 addresses (backtrace.c:42)
DLGLOBAL ERROR /lib/x86_64-linux-gnu/libosmocore.so.22(_osmo_fsm_inst_dispatch+0x486) [0x7f4b057e68d6] (backtrace.c:53)
DLGLOBAL ERROR /lib/x86_64-linux-gnu/libosmo-sigtran.so.10(osmo_ss7_as_add_asp+0x15b) [0x7f4b055596ab] (backtrace.c:53)
DLGLOBAL ERROR /lib/x86_64-linux-gnu/libosmo-sigtran.so.10(osmo_sccp_simple_client_on_ss7_id+0x97b) [0x7f4b0557381b] (backtrace.c:53)
DLGLOBAL ERROR osmo-msc(+0x185ca) [0x55b74b7575ca] (backtrace.c:53)
DLGLOBAL ERROR osmo-msc(+0x1780a) [0x55b74b75680a] (backtrace.c:53)
DLGLOBAL ERROR /lib/x86_64-linux-gnu/libc.so.6(+0x29d90) [0x7f4b05167d90] (backtrace.c:53)
DLGLOBAL ERROR /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80) [0x7f4b05167e40] (backtrace.c:53)
DLGLOBAL ERROR osmo-msc(+0x181c5) [0x55b74b7571c5] (backtrace.c:53)
DLSCCP NOTICE OsmoMSC-A-Iu: Using ASP instance asp-clnt-OsmoMSC-A-Iu (sccp_user.c:699)
DLSS7 NOTICE 0: Creating SCCP instance (osmo_ss7.c:408)
DSGS NOTICE SGs socket bound to r=NULL<->l=192.168.75.185:29118 (sgs_server.c:186)
DMSC NOTICE A-interface: SCCP user OsmoMSC-A:RI=SSN_PC,PC=(no PC),SSN=BSSAP, cs7-instance 0 ((null)) (msc_main.c:806)
DMSC NOTICE Iu-interface: SCCP user OsmoMSC-IuCS:RI=SSN_PC,PC=(no PC),SSN=RANAP, cs7-instance 0 ((null)) (msc_main.c:826)
DLINP NOTICE 127.0.0.1:4222 connection done (ipa.c:143)
DLINP NOTICE received ID_GET for unit ID 0/0/0 (ipaccess.c:897)
DLM3UA NOTICE 0: asp-asp-clnt-OsmoMSC-A-Iu: Received NOTIFY Type State Change:AS Inactive () (m3ua.c:622)
DLSS7 NOTICE xua_default_lm(asp-clnt-OsmoMSC-A-Iu)[0x55b74ca95a20]{ACTIVE}: Ignoring primitive M-ASP_ACTIVE.confirm (xua_default_lm_fsm.c:400)
DLM3UA NOTICE 0: asp-asp-clnt-OsmoMSC-A-Iu: Received NOTIFY Type State Change:AS Active () (m3ua.c:622)
DSGS NOTICE r=192.168.75.181:51999<->l=192.168.75.185:29118: Connection lost (sgs_server.c:101)
DSGS NOTICE r=192.168.75.181:37170<->l=192.168.75.185:29118: Connection lost (sgs_server.c:101)
DSGS NOTICE r=192.168.75.181:42624<->l=192.168.75.185:29118: Connection lost (sgs_server.c:101)
DSGS NOTICE r=192.168.75.181:40043<->l=192.168.75.185:29118: Connection lost (sgs_server.c:101)
DSGS NOTICE r=192.168.75.181:51479<->l=192.168.75.185:29118: Connection lost (sgs_server.c:101)