### Description
<!--
Explain what you did, what you expected to happen, and what actually happened.
-->
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
<!--
If the issue can be reproduced, describe how it can be done.
-->
* 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:
https://github.com/kamailio/kamailio/commit/52ab6f3dcf5ad8d967be8bdecaa64ef31cbfbe33
### 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**:
<!--
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16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
-->
```
Ubuntu Jammy
```
--
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