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Kamailio is setup as a WebRTC to SIP(UDP) gateway. It forwards WSS to UDP and UDP to WSS connections.
This was doing fine until 5.8.2 (so 5.8.1 is running perfectly).
Since 5.8.2 (and 5.8.3) the following message is printed on sending towards a connected WSS connection:
Sep 4 17:02:20 p01t-1 kamailio.webrtc[336177]: WARNING: webrtc:tm [../../core/forward.h:204]: msg_send_buffer(): TCP/TLS connection for WebSocket could not be found
Sep 4 17:02:20 p01t-1 kamailio.webrtc[336177]: WARNING: webrtc:tm [t_fwd.c:1586]: t_send_branch(): sending request on branch 0 failed
Sep 4 17:02:20 p01t-1 kamailio.webrtc[336177]: WARNING: webrtc:<script>: Forwarding request failed
Sep 4 17:02:20 p01t-1 kamailio.webrtc[336177]: INFO: webrtc:sl [sl_funcs.c:420]: sl_reply_error(): message marked with delayed-reply flag
Code:
# $ru = INVITE sip:43130110221@192.168.48.131:5063;transport=udp;ntv3=4;alias=1.2.3.4~51820~6;fs=tls:100.100.100.100:443;uri=sip:43130110221%40192.168.63.105%3bline%3dwc-x9u7ra%3bx-ts;line=wc-x9u7ra;x-ts
if ($(ru{uri.param,alias}{s.len}) && $(ru{uri.param,uri}{s.len})) {
$var(target) = $rU;
if (!handle_ruri_alias()) {
xlog("L_ERR", ">> Bad alias <$ru>");
sl_send_reply("400", "Bad Request");
exit;
}
if ($(ru{uri.param,fs}{s.len})) {
xlog("L_INFO", ">> setting local socket to $(ru{uri.param,fs})");
$fs = $(ru{uri.param,fs});
}
if ($dP =~ "ws|tls|tcp") {
set_forward_no_connect();
xlog("L_INFO", ">> checking tcp connection to $dd:$dp");
if(tcp_get_conid("$dd:$dp", "$var(conid)")) {
xlog("L_INFO", ">> connection id to $dd:$dp is: $var(conid)");
} else {
if (is_method("NOTIFY")) {
xlog("L_ERR", ">> connection to $dd:$dp is no longer connected. Client must resubscribe!");
sl_send_reply("604", "Please Remove Subscription");
} else {
xlog("L_ERR", ">> connection to $dd:$dp is no longer connected. Client must reregister!");
sl_send_reply("480", "TCP not connected");
}
exit;
}
}
$ru = $(ru{uri.param,uri}{s.unescape.param});
$rU = $var(target);
xlog("L_INFO", ">> OUT-CONTACT: $rm $ru ($du) - rP=$rP -> dp=$dP nh(P)=$nh(P)");
route(FORWARD); # route that call immediately
}
route[FORWARD] {
xlog("L_INFO", "ROUTE[FORWARD] - R-URI/D-URI: $rm $ru ($du): $mf");
...
xlog("L_INFO", ">> Forwarding request now");
if (!t_relay()) {
xlog("L_WARN", "Forwarding request failed");
...
onsend_route {
if ($mt==1) {
xlog("L_INFO", ">>> Sending Request: $rm $ru ($sndfrom(ip):$sndfrom(port) -> $sndto(ip):$sndto(port): $du)");
xlog("L_INFO", "$sndto(buf)");
#!ifdef WITH_HOMER
# for some reason the ACK flagged in FORWARD is not traced on sending out
if (isflagset(FL_TRACE)) {
xlog("L_INFO", ">> FL_TRACE on $rm set!");
}
if (is_method("ACK") && isflagset(FL_TRACE)) {
sip_trace();
}
#!endif
} else {
xlog("L_INFO", ">>> Sending Reply: $rs $rr ($sndfrom(ip):$sndfrom(port) -> $sndto(ip):$sndto(port))");
xlog("L_INFO", "$sndto(buf)");
}
}
Any call to the WebSocket is rejected now. Working fine before 5.8.2.
kamailio.webrtc[338351]: INFO: webrtc:<script>: ROUTE[OUTBOUND] - route to registered contact: INVITE sip:15551234521@192.168.48.131:5063;transport=udp;ntv3=4;alias=101.100.100.129~52201~6;fs=tls:100.100.100.131:443;uri=sip:15551234521%40192.168.63.105%3bline%3dwc-x9u7ra%3bx-ts;line=wc-x9u7ra;x-ts
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> read domain from P-Called-Party-ID: ws2.ipbx.tld
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> Reduce Session Timer from 1800 to 120
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> setting local socket to tls:100.100.100.131:443
optional. same without $fs=tls:100.100.100.131:443 (ws: and wss: are invalid for $fs)
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> checking tcp connection to 101.100.100.129:52201
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> connection id to 101.100.100.129:52201 is: 1
The connection is found and alive!
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> OUT-CONTACT: INVITE sip:15551234521@192.168.63.105;line=wc-x9u7ra;x-ts (sip:101.100.100.129:52201;transport=ws) - rP=UDP -> dp=ws nh(P)=ws
kamailio.webrtc[338351]: INFO: webrtc:<script>: ROUTE[FORWARD] - R-URI/D-URI: INVITE sip:15551234521@192.168.63.105;line=wc-x9u7ra;x-ts (sip:101.100.100.129:52201;transport=ws): 8388624
kamailio.webrtc[338351]: INFO: webrtc:<script>: ROUTE[RTPP_REQ]
kamailio.webrtc[338351]: INFO: webrtc:<script>: ROUTE[RTP_MANAGE]
kamailio.webrtc[338351]: INFO: webrtc:<script>: > SIP -> WebRTC, bridging RTP->SRTP-DTLS and adding ICE - o-313732353436333239323434393936-ytpwonh6n9aq
kamailio.webrtc[338351]: INFO: webrtc:<script>: ROUTE[RTP_MANAGE] method:INVITE, ruri:sip:15551234521@192.168.63.105;line=wc-x9u7ra;x-ts, callid:o-313732353436333239323434393936-ytpwonh6n9aq, rtpengine_manage:call-id=o-313732353436333239323434393936-ytpwonh6n9aq via-branch=auto trust-address r
eplace-origin replace-session-connection rtcp-mux-accept rtcp-mux-require generate-mid SDES-off ICE=force ICE-lite=forward UDP/TLS/RTP/SAVPF pad-crypto
kamailio.webrtc[338351]: INFO: webrtc:<script>: > rtpengine(): SUCCESS
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> Forwarding request now
100 trying ...
kamailio.webrtc[338351]: INFO: webrtc:<script>: >>> Sending Request: INVITE sip:15551234521@192.168.63.105;line=wc-x9u7ra;x-ts (100.100.100.131:443 -> 101.100.100.129:52201: sip:101.100.100.129:52201;transport=ws)
kamailio.webrtc[338351]: INFO: webrtc:<script>: INVITE sip:15551234521@192.168.63.105;line=wc-x9u7ra;x-ts SIP/2.0
Record-Route: <sip:100.100.100.131:443;transport=ws;r2=on;lr;ftag=ly9574qrtx;x-dir=o;x-rtpp=1>
Record-Route: <sip:192.168.48.131:5063;r2=on;lr;ftag=ly9574qrtx;x-dir=o;x-rtpp=1>
Via: SIP/2.0/WSS 100.100.100.131:443;branch=z9hG4bK727a.06944932aa61c384f55e7cbc0a59ec0a.0
Via: SIP/2.0/UDP 192.168.48.74:5060;branch=z9hG4bKgWoe~Gc5kT
Via: SIP/2.0/UDP 192.168.48.74:5060;branch=z9hG4bKvA3weqaC-e;internal=6715591-1
From: "Walter 22" <sip:22@ws2.ipbx.tld>;tag=ly9574qrtx
To: <sip:21@ws2.ipbx.tld;user=phone>
Call-ID: 313732353436333239323434393936-ytpwonh6n9aq-UASession-p1EoqWEkFt-CQ-100-
CSeq: 1 INVITE
Max-Forwards: 67
Supported: replaces,from-change,timer,histinfo
Allow: INVITE,ACK,CANCEL,BYE,INFO,REFER,PRACK,NOTIFY
Contact: <sip:192.168.48.74:5060;internal=6715591-1;type=tpcc>
Content-Length: 649
Content-Type: application/sdp
Record-Route: <sip:192.168.48.74:5060;transport=udp;lr>
Allow-Events: talk,hold,refer
Accept: application/sdp
Session-Expires: 90;refresher=uas
[...] shortened SDP body
kamailio.webrtc[338351]: INFO: webrtc:<script>: >> FL_TRACE on INVITE set!
kamailio.webrtc[338351]: INFO: webrtc:<script>: Network sending:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
INVITE sip:15551234521@192.168.63.105;line=wc-x9u7ra;x-ts SIP/2.0
Record-Route: <sip:100.100.100.131:443;transport=ws;r2=on;lr;ftag=ly9574qrtx;x-dir=o;x-rtpp=1>
Record-Route: <sip:192.168.48.131:5063;r2=on;lr;ftag=ly9574qrtx;x-dir=o;x-rtpp=1>
Via: SIP/2.0/WSS 100.100.100.131:443;branch=z9hG4bK727a.06944932aa61c384f55e7cbc0a59ec0a.0
Via: SIP/2.0/UDP 192.168.48.74:5060;branch=z9hG4bKgWoe~Gc5kT
Via: SIP/2.0/UDP 192.168.48.74:5060;branch=z9hG4bKvA3weqaC-e;internal=6715591-1
From: "Walter 22" <sip:22@ws2.ipbx.tld>;tag=ly9574qrtx
To: <sip:21@ws2.ipbx.tld;user=phone>
Call-ID: 313732353436333239323434393936-ytpwonh6n9aq-UASession-p1EoqWEkFt-CQ-100-
CSeq: 1 INVITE
Max-Forwards: 67
Supported: replaces,from-change,timer,histinfo
Allow: INVITE,ACK,CANCEL,BYE,INFO,REFER,PRACK,NOTIFY
Contact: <sip:192.168.48.74:5060;internal=6715591-1;type=tpcc>
Content-Length: 649
Content-Type: application/sdp
Record-Route: <sip:192.168.48.74:5060;transport=udp;lr>
Allow-Events: talk,hold,refer
Accept: application/sdp
Session-Expires: 90;refresher=uas
[...] shortened SDP body
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
kamailio.webrtc[338351]: WARNING: webrtc:tm [../../core/forward.h:204]: msg_send_buffer(): TCP/TLS connection for WebSocket could not be found
kamailio.webrtc[338351]: WARNING: webrtc:tm [t_fwd.c:1586]: t_send_branch(): sending request on branch 0 failed
kamailio.webrtc[338351]: WARNING: webrtc:<script>: Forwarding request failed
Downgrade to 5.8.1
—
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