Route - loose_route - sr-users

5 Mar 2021

Hello,

I have a strange issue here with the Route header not been respected by the
Kamailio server.

I'm getting the INVITE from the SBC-1, adding my own RR header (SBC-2), and
send it to the SBC-3

This is the Invite I'm sending outside to the SBC-3 Proxy.

```
INVITE sip:+123456789@192.168.1.1:5060 SIP/2.0
Record-Route: <sip:SBC-2:5067;transport=tls;r2=on;ftag=as2b53df6f;lr>
Record-Route: <sip:SBC-1;ftag=as2b53df6f;lr>
```

I'm getting back 200OK with mirrored RR, the call is established
successfully.

But, the problem is with the BYE message coming from the SBC-3:

```
BYE sip:+123456789@192.168.1.2:5060 SIP/2.0
ROUTE:
<sip:SBC-2:5067;transport=tls;r2=on;ftag=as2b53df6f;lr>,<sip:SBC-1;ftag=as2b53df6f;lr>
```

There are 2 routes within a single header. Afaik, loose_function should
remove his own Route header (SBC-2) and forward the message to the next
Route (SBC-1), or to the URI if there are not other Routes. But, in my
case, for some reason Kamailio on SBC-2 is sending the request directly to
the URI, bypassing the SBC-1.

In the logs I'm getting the following errors:

*rr_do_force_send_socket(): no socket found to match second RR (sip:SBC-1)*
*rr_do_force_send_socket(): second RR uri is not myself (sip:SBC-1)*

To enforce the socket I was trying to use 'sn=interface', then I'm not
getting anymore this error - but still, Kamailio sends the message directly
to the URI, instead of SBC-1.
Is there anything wrong with my config, or I am missing something with the
Route headers?

Kamailio Version: version: kamailio 5.4.4 (x86_64/linux) bdf4e0

Thank you.