Description

We are running Kamailio in front of a backend farm, REGISTERs go directly to the backend. After registration, the backend sends out OPTIONS requests periodically. This worked with 5.8.2. Now when running a 5.8.3 server (taken from your apt repository), I get the following errors in the log:

Sep 04 14:41:36 sipproxy /usr/sbin/kamailio[124]: ERROR: tm [ut.h:235]: uri2dst2(): bad_uri: [sip:[[2001:16e0:affe:affe:24a2:55a2:15bf:23d1]]:59580;transport=tls]
Sep 04 14:41:36 sipproxy /usr/sbin/kamailio[124]: ERROR: tm [t_fwd.c:1764]: t_forward_nonack(): failure to add branches

There are extra square brackets in the URI. I compared the REGISTERs from old and new Kamailio to the backend, and also the OPTIONS packets sent by the backend, the are identical except for the obvious differences.

Troubleshooting

Reproduction

Have a Kamailio with nathelper enabled.
Do something like this for nat detection:

   def ksr_route_natdetect(self, msg):
        KSR.force_rport()
        # Checks if request goes to backend or not
        if not msg.is_internal_message():
            KSR.setbflag(FLB_NATB)
            KSR.setflag(FLT_NATS)
            if KSR.textops.is_present_hf("Contact") > 0:
                if KSR.nathelper.set_contact_alias() < 0:
                    msg.log("Error in aliasing contact")
                    KSR.sl.sl_send_reply(400,"Bad request")
                    return False
        else:
            if msg.is_request():
                KSR.nathelper.handle_ruri_alias()
        return 1

register a phone to the backend (e.g. an Asterisk server)
send an OPTIONS packet from the backend to the registered device.

SIP

The REGISTER from Kamailio to the backend looks like this:

REGISTER sip:domain;transport=tcp SIP/2.0
Via: SIP/2.0/TCP 100.74.11.1:5063;branch=z9hG4bK6c3e.2cedb59e7724d263255c1996d9d2d4fa.0;i=6
Via: SIP/2.0/TLS [2001:16e0:affe:affe:24a2:55a2:15bf:23d1]:61391;received=2001:16e0:affe:affe:24a2:55a2:15bf:23d1;rport=61391;branch=z9hG4bKPjAB7F905A-A6A2-491D-A456-89C8FD4C5183;alias
Max-Forwards: 69
From: <sip:dZmIQyb70tzt2J9@sdammone>;tag=AAA80708-4968-4B49-95B8-7DBCEFCC5E62
To: <sip:dZmIQyb70tzt2J9@sdammone>
Call-ID: 4922AA11-F4BA-49D0-AE64-EECF49735684
CSeq: 44208 REGISTER
User-Agent: foobar
Supported: outbound, path
Contact: <sip:dZmIQyb70tzt2J9@[2001:16e0:affe:affe:24a2:55a2:15bf:23d1]:61391;transport=TLS;p-xs=6eb17056fba34ce6bc7d458a1a7a80ba;ob;alias=[2001:16e0:affe:affe:24a2:55a2:15bf:23d1]~61391~3>;reg-id=1;+sip.instance="<urn:uuid:00000000-0000-0000-0000-00000c73bfc6>"
Expires: 300
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Content-Length:  0
Path: <sip:100.74.11.1:5063;transport=tcp;lr;xep=true>

The OPTIONS packet from backend to the client looks like this:

OPTIONS sip:dZmIQyb70tzt2J9@[2001:16e0:affe:affe:24a2:55a2:15bf:23d1]:61391;transport=TLS;p-xs=6eb17056fba34ce6bc7d458a1a7a80ba;ob;alias=[2001:16e0:affe:affe:24a2:55a2:15bf:23d1]~61391~3 SIP/2.0
Via: SIP/2.0/TCP 100.74.130.66:5060;rport;branch=z9hG4bKPj3e558221-2506-4a2b-9daa-ff7e73d05e8c;alias
From: <sip:dZmIQyb70tzt2J9@sdammone>;tag=18c9809a-4775-4c35-8e88-5c5a7bdcf1fe
To: <sip:dZmIQyb70tzt2J9@[2001:16e0:affe:affe:24a2:55a2:15bf:23d1];p-xs=6eb17056fba34ce6bc7d458a1a7a80ba;ob;alias=[2001:16e0:affe:affe:24a2:55a2:15bf:23d1]~61391~3>
Contact: <sip:dZmIQyb70tzt2J9@100.74.130.66:5060;transport=TCP>
Call-ID: 2e1efbd3-9366-4542-b909-83429266b6ef
CSeq: 2989 OPTIONS
Supported: path
Route: <sip:100.74.11.1:5063;transport=tcp;lr;xep=true>
Max-Forwards: 70
User-Agent: barfoo
Content-Length:  0

Log Messages

Sep 04 14:41:36 sipproxy /usr/sbin/kamailio[124]: ERROR: tm [ut.h:235]: uri2dst2(): bad_uri: [sip:[[2001:16e0:affe:affe:24a2:55a2:15bf:23d1]]:59580;transport=tls]
Sep 04 14:41:36 sipproxy /usr/sbin/kamailio[124]: ERROR: tm [t_fwd.c:1764]: t_forward_nonack(): failure to add branches

Possible Solutions

Downgrading to 5.8.2 again works.

I suppose, the problem comes from this commit by @vingarzan: 52ab6f3

Additional Information

Kamailio Version - output of kamailio -v

version: kamailio 5.8.3 (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, 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: unknown
compiled with gcc 11.4.0

Operating System:

Ubuntu Jammy

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