4 Sep
2024
4 Sep
'24
6:38 p.m.
### Description
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
```
### Troubleshooting
Code:
- handle_ruri_alias() sets the $du from the alias parameter and looks good:
- $fs sets the local socket (saved on incoming register to the Contact URI) (optional,
removed, same result)
- set_forward_no_connect() we cannot connect outbound, the connection must exists
- tcp_get_conid("$dd:$dp", "$var(conid)") and well: it is existing!
- reset the R-URI to the contact
- and send out with t_relay()
```
# $ru = INVITE
sip:43130110221@192.168.48.131:5063;transport=udp;ntv3=4;alias=1.2.3.4~51820~6;fs=tls:100.100.100.100:443;uri=sip:43130110221%40192.168.63.105%3bline%3dwc-x9u7ra%3bx-ts;line=wc-x9u7ra;x-ts
if ($(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)");
}
}
```
#### Reproduction
Any call to the WebSocket is rejected now. Working fine before 5.8.2.
#### Log Messages
```
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
```
### ~~Possible~~ Solutions
Downgrade to 5.8.1
--
Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/3969
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