Multihomed server not handling dialog's BYE

Hi all,
trying to understand what is not working on my conf, without luck.
Can you help me?
Issue: as title says, incoming BYE of a dialog are not processed because "loose_route()" function always fails (FALSE). So server always reply with 404 Not Here.
I cannot understand why loose_route fails.
Kam server has 2 NICs:
LAN: 192.168.1.3 that see Asterisk (192.168.1.200)
DMZ: 10.0.1.3 advertised public_ip

Incoming BYE has Route: header. See below

2026/07/01 10:28:16.935119 52.114.75.24:12229 -> 10.0.1.3:5061
BYE sip:sbc-kam-teams.domain.eu:5061;transport=tls SIP/2.0
From: <sip:[email protected]:5061;user=phone>;tag=9e168a8cac924f5395732f051b56231c
To: <sip:[email protected]>;user=phone;tag=633e9a76-b8c2-4869-96a8-c1ab18bf5bea
Via: SIP/2.0/TLS 52.114.75.24;branch=z9hG4bK4778a595
CSeq: 2 BYE
Call-ID: c04608351d6d5b98bd8b11e94070721b
Max-Forwards: 70
Route: <sip:sbc-kam-teams.domain.eu:5061;lr;r2=on;ftag=9e168a8cac924f5395732f051b56231c;did=1db.ba12;transport=Tls>,<sip:192.168.1.3;lr;r2=on;ftag=9e168a8cac924f5395732f051b562
31c;did=1db.ba12>
Reason: Q.850;cause=16;text="d4c62fdd-5df8-4791-9bf8-76bfd638e2bf;CallEndReasonLocalUserInitiated"
Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS
Contact: <sip:api-du-b-euwe.pstnhub.microsoft.com:443;x-i=d4c62fdd-5df8-4791-9bf8-76bfd638e2bf;x-c=c04608351d6d5b98bd8b11e94070721b/d/8/aeb7a7f3b4114b1e82f8ca7efdaa7581>
Content-Length: 0
User-Agent: Microsoft.PSTNHub.SIPProxy v.2026.6.29.3 i.EUWE.10

Here last 200 Ok sent from kamailio to Teams:

2026/07/01 10:28:15.288945 10.0.1.3:5061 -> 52.114.75.24:12228
SIP/2.0 200 OK
Via: SIP/2.0/TLS 52.114.75.24;rport=12228;branch=z9hG4bKb419a3e8
Record-Route: <sip:192.168.1.3;lr;r2=on;ftag=9e168a8cac924f5395732f051b56231c;did=1db.ba12>
Record-Route: <sip:sbc-kam-teams.acscloud.eu:5061;transport=tls;lr;r2=on;ftag=9e168a8cac924f5395732f051b56231c;did=1db.ba12>
Record-Route: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>
Call-ID: c04608351d6d5b98bd8b11e94070721b
From: <sip:[email protected];user=phone>;tag=9e168a8cac924f5395732f051b56231c
Contact: <sip:sbc-kam-teams.acscloud.eu:5061;transport=tls>
Server: SBC-Montefato
To: <sip:[email protected];user=phone>;tag=633e9a76-b8c2-4869-96a8-c1ab18bf5bea
CSeq: 1 INVITE
Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, INFO, REFER
Supported: 100rel, timer, replaces, norefersub
Session-Expires: 3600;refresher=uac
Require: timer
Content-Type: application/sdp
Content-Length:   279

v=0
o=- 29979 2 IN IP4 128.116.144.30
s=Asterisk
t=0 0
m=audio 32902 RTP/SAVP 8
c=IN IP4 128.116.144.30
a=mid:1
a=rtpmap:8 PCMA/8000
a=sendrecv
a=rtcp:32903
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:LX+X3mOVOEA1ceqba0xNXAEINQ7C7E/ro8Qxjt8g
a=ptime:20
a=maxptime:140

Here you can find my entire conf:

https://pastebin.com/Bz7cRiv0
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions -- [email protected]
To unsubscribe send an email to [email protected]
Important: keep the mailing list in the recipients, do not reply only to the sender!