Description

When call routed to WebRTC client and used record_route(), then Record-Router header does not contain port of socket where WebRTC client connected.
When used tcp_reuse_port = yes, then ACK cannot be delivered to WebRTC client (#2849).

Reproduction

I prepared a minimal config that allows reproduce the issue and attached a log file for the test call.

# use compact IPv6 addresses
ipv6_hex_style = "c"
enable_tls=1
tcp_accept_no_cl=yes

######## Kamailio control connector module ########
loadmodule "ctl.so"
modparam("ctl", "binrpc_buffer_size", 4096)
loadmodule "pv.so"
loadmodule "sl.so"
loadmodule "xlog.so"
loadmodule "tls.so"
loadmodule "nathelper.so"
modparam("tls", "config", "/etc/kamailio/tls.cfg")
loadmodule "xhttp.so"
loadmodule "websocket.so"
loadmodule "ipops.so"
loadmodule "siputils.so"
loadmodule "rr.so"

loadmodule "debugger.so"
modparam("debugger", "cfgtrace", 1)
modparam("debugger", "log_level_name", "exec")
log_stderror=yes


# IPv4 listeners
listen=udp:eth0:5060
listen=tcp:eth0:5060
listen=tls:eth0:5061
listen=tls:eth0:7001

# IPv6 listeners
listen=udp:[2600:1f18:578:5701::7e]:5060
listen=tcp:[2600:1f18:578:5701::7e]:5060
listen=tls:[2600:1f18:578:5701::7e]:5061
listen=tls:[2600:1f18:578:5701::7e]:7001

request_route {
    if (!has_totag()) {
        record_route();
    }

    if (is_ipv4($si)) {
        route(WEBRTC_PBX);
    } else {
        route(PBX_WEBRTC);
    }
}

route[WEBRTC_PBX] {
    set_contact_alias();
    $du = "sip:[2600:1f14:6d8:5409::100]:5080;transport=tcp";
    forward();
    exit;
}

route[PBX_WEBRTC] {
    handle_ruri_alias();
    forward();
    exit;
}

event_route[xhttp:request] {
    if (!($hdr(Upgrade)=~"websocket"
            && $hdr(Connection)=~"Upgrade"
            && $rm=~"GET")) {
        $var(status_code) = 400;
        $var(reason_phrase) = "Bad Request";
        xhttp_reply("$var(status_code)", "$var(reason_phrase)", "text/plain", "$var(reason_phrase)");
        exit;
    }

    if (!ws_handle_handshake()) {
        $var(status_code) = 400;
        $var(reason_phrase) = "Bad Request";
        xhttp_reply("$var(status_code)", "$var(reason_phrase)", "text/plain", "$var(reason_phrase)");
        exit;
    }

    exit;
}

Log Messages

For Call-ID: a8c7450a-131c-11ec-9546-a727fc4b684e

INVITE sips:safarov@df7jal23ls0d.invalid;rtcweb-breaker=no;transport=wss SIP/2.0^M
Record-Route: <sips:3.236.25.254;transport=ws;r2=on;lr;ftag=FNBFNvy0atDeK>^M
Record-Route: <sips:[2600:1f18:578:5701::7e];transport=tcp;r2=on;lr;ftag=FNBFNvy0atDeK>^

Client connected to socket tls:3.236.25.254:7001 but using record_route() generated

Record-Route: <sips:3.236.25.254;transport=ws;r2=on;lr;ftag=FNBFNvy0atDeK>

Full logs at kam.log

Additional Information

• Kamailio Version - output of kamailio -v
  used master branch with small customization, base commit c503d2b

• Operating System:
  aarch64

[root@tmp kamailio]# cat /etc/os-release 
NAME="CentOS Linux"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"

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