Hello List,

of course - best way is not to use sips: uri scheme. But i have to deal with that.

I try to configure an multihomed kamailio (public/private IP) in front of my SIP-Servers.

One of my softphones variants used TLS for connection but the INVITES of this softphone use the "sips" URI scheme.

As i saw in other posts, this seems to be an issue for many people.

In my case it breaks the routing to my internal sip-server (only plain udp).

Most of my config is similar to havfos example + TLS.

https://github.com/havfo/WEBRTC-to-SIP/blob/master/etc/kamailio/kamailio.cfg

I tried to fixed that with this extra route - 

but this breaks the dialog somewhere - after 60 seconds i have no audio and the BYE becomes another CSeq:

in the request_route right after route(AUTH)  i add my route(FIX_SIPS)

        if (is_method("INVITE|SUBSCRIBE")) {

                if ($ru =~ "^sips:") {

                        route(FIX_SIPS);

                } else {

                        record_route();

                }

        }

route[FIX_SIPS] {

        if ($ru =~ "^sips:") {

                xlog("L_INFO","---FIX_SIPS-before: ru:($ru)");

                $var(orig_uri) = $ru;

                $ru = "sip:" + $rU + "@" + $td;

                xlog("L_INFO","---FIX_SIPS-now: $rU $td ru:($ru) orig_uri:($var(orig_uri))");

                record_route();

                #$ru = $var(orig_uri);

                xlog("L_INFO","---FIX_SIPS-after: ru:($ru)");

        }

}

172.20.120.81 = Kamailio private IP

172.20.120.79 = My internal SIP-Server (B2BUA)

I used kamailio with CentOS 7 and RTPENGINE 63bdd615 from master

kamailio-5.0.2-3.1.x86_64

kamailio-tls-5.0.2-3.1.x86_64

kamailio-mysql-5.0.2-3.1.x86_64

kamailio-websocket-5.0.2-3.1.x86_64

--

Kind Regards
*Karsten Horsmann*