Description
We use below config to test the topology hiding function，when kamailio receive “update” message，doesn't send out，it will send to itself with destination port 5060；

Troubleshooting
loadmodule "ndb_redis.so"
loadmodule "topos_redis.so"
loadmodule "topos.so"
modparam("ndb_redis", "server", "name=srv8;addr=127.0.0.1;port=6381;db=2")
modparam("topos", "storage", "redis")
modparam("topos", "db_url", "redis://127.0.0.1:6381/2")
modparam("topos_redis", "serverid", "srv8")

Call flow
UE-----------------PROXY-------------B2bua
invite-------------->|------------------>invite
183<----------------|<------------------183
Prack------------ ->|------------------>Prack
200ok<-------------|<-----------------200ok
update1---------->|-------------|
|update2<---|
404<---------------|

update1:
UPDATE sip:atpsh-5fc1a2c3-5749-2@172.18.67.40 SIP/2.0
Via: SIP/2.0/UDP 172.18.67.34:5062;branch=z9hG4bK-15000-1-0
From: tel:+8618768860000;tag=1
To: tel:32001232;phone-context=ims.mnc002.mcc460.3gppnetwork.org;tag=BH83c9DQXKgvp
Call-ID: 1-15000@172.18.67.34
CSeq: 1002 UPDATE
Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,UPDATE,INFO,PRACK,NOTIFY,MESSAGE,REFER
Contact: sip:+8618768860000@172.18.67.34:5062;zte-did=8-11-20481-2871-12-666-65535;Hpt=8ec8_16;CxtId=4;TRC=ffffff-ffffffff;audio;vid
;+sip.instance="urn:gsma:imei:86183004-974965-0";+g.3gpp.mid-call;+g.3gpp.srvcc-alerting;+g.3gpp.pss-srvcc-orig-pre-alerting;+g.3gpp
csi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel"

update2:

UPDATE sip:172.18.67.50;r2=on;lr=on;ftag=1;did=874.5af1;vsf=BwwcABoAAQcADwAICAYAcAEHMi4xOC42Ny4zNA-- SIP/2.0
Via: SIP/2.0/UDP 172.18.67.40:55067;branch=z9hG4bK296a.feb7a8004f743a745739026289e0010e.0
From: tel:+8618768860000;tag=1
To: tel:32001232;phone-context=ims.mnc002.mcc460.3gppnetwork.org;tag=BH83c9DQXKgvp
Call-ID: 1-15000@172.18.67.34
CSeq: 1002 UPDATE
Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,UPDATE,INFO,PRACK,NOTIFY,MESSAGE,REFER
Max-Forwards: 70
Require: precondition
Supported: histinfo,replaces,precondition,100rel,timer
User-Agent: IM-client/OMA1.0 HW-Rto/V1.0
P-Access-Network-Info: 3GPP-E-UTRAN;utran-cell-id-3gpp=4600039c6b98855b;network-provided;sbc-domain=luypsbc22bzx.0371.101.ha.chinamobi
.com
P-Charging-Vector: icid-value=No1ZR2PilD-0000a442-0d-0000816e-001;orig-ioi=chinamobile
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 743
Contact: sip:btpsh-5fc1a2c3-5749-2@172.18.67.50

below ip and port are configured for kamailio;
172.18.67.40:55067
172.18.67.50:5060

Additional Information
version: kamailio 5.4.2 (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, 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_BLACKLIST, HAVE_RESOLV_RES
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:
compiled on 20:13:39 Nov 9 2020 with gcc 4.8.5

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