31 Jul
2014
31 Jul
'14
12:33 a.m.
My kamailio.cfg configuration file is attached.
I am having trouble using SIP.js (http://sipjs.com/) to handle a SUBSCRIBE for presence
information. With Jitsi clients (using plain UDP), presence seems to work correctly.
However, when using SIP.js via a websocket, Kamailio is unable to send the NOTIFY
for the presence event. However, MESSAGE packets are routed correctly between peers, even
through websockets.
The location table after registration looks like this:
+-----+----------------------+----------+------------------+--------------------------------------+------------------------------------+------+---------------------+-------+------------------------+------+---------------------+-------+--------+--------------+-----------------------+---------+-------------------------------------------------+--------+
| id | ruid | username | domain | contact
| received | path | expires | q | callid
| cseq | last_modified | flags | cflags |
user_agent | socket | methods | instance
| reg_id |
+-----+----------------------+----------+------------------+--------------------------------------+------------------------------------+------+---------------------+-------+------------------------+------+---------------------+-------+--------+--------------+-----------------------+---------+-------------------------------------------------+--------+
| 192 | uloc-53d96398-1afc-1 | admin | pbx.villacis.com |
sip:nfinhooe@192.0.2.90;transport=ws | sip:192.168.3.2:41478;transport=WS | NULL |
2014-07-30 17:18:57 | -1.00 | 6a2dot9ihoobhng9ackqmq | 90 | 2014-07-30 17:08:57 | 0
| 64 |
SIP.js/0.5.0 | tls:192.168.2.18:5061 | 782 |
<urn:uuid:b8888e95-7833-46a4-a21e-8d2e809a66b8> | 1 |
+-----+----------------------+----------+------------------+--------------------------------------+------------------------------------+------+---------------------+-------+------------------------+------+---------------------+-------+--------+--------------+-----------------------+---------+-------------------------------------------------+--------+
When running the following javascript code:
var subs = ua.subscribe('admin(a)pbx.villacis.com'com', 'presence');
subs.on('notify', function (n) { alert(n.request.body); });
... I see the following traffic in the browser console area:
SUBSCRIBE sip:admin@pbx.villacis.com SIP/2.0
Via: SIP/2.0/WSS 192.0.2.90;branch=z9hG4bK3654279
Max-Forwards: 70
To: <sip:admin@pbx.villacis.com>
From: "Administrator" <sip:admin@pbx.villacis.com>;tag=rt0men9qve
Call-ID: pa7jno8q3op5pu0qitad
CSeq: 322 SUBSCRIBE
Proxy-Authorization: Digest algorithm=MD5, username="admin",
realm="pbx.villacis.com", nonce="U9lswVPZa5WSu5jz1P/jIOJTvthKXw6v",
uri="sip:admin@pbx.villacis.com",
response="f7246e64573b5888d69896a70d4204aa"
Event: presence
Expires: 3600
Contact: <sip:nfinhooe@192.0.2.90;transport=ws>
Allow: ACK,CANCEL,BYE,OPTIONS,MESSAGE
Supported: outbound
User-Agent: SIP.js/0.5.0
Content-Length: 0
SIP/2.0 202 OK
Via: SIP/2.0/WSS 192.0.2.90;branch=z9hG4bK3654279;rport=41478;received=192.168.3.2
To: <sip:admin@pbx.villacis.com>;tag=a6a1c5f60faecf035a1ae5b6e96e979a-84c3
From: "Administrator" <sip:admin@pbx.villacis.com>;tag=rt0men9qve
Call-ID: pa7jno8q3op5pu0qitad
CSeq: 322 SUBSCRIBE
Expires: 3600
Contact: <sip:192.168.2.18:5061;transport=ws>
Server: kamailio (4.1.4 (x86_64/linux))
Content-Length: 0
However, I also get the following messages in the kamailio log:
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: WARNING: <core>
[msg_translator.c:2506]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not
be found
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: tm [t_msgbuilder.c:1365]:
assemble_via(): assemble_via: via building failed
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: tm [t_msgbuilder.c:1544]:
build_uac_req(): build_uac_req(): Error while assembling Via
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: tm [uac.c:338]: t_uac_prepare():
t_uac: Error while building message
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: presence [notify.c:1591]:
send_notify_request(): in function tmb.t_request_within
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: presence [notify.c:1678]: notify():
sending Notify not successful
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: presence [subscribe.c:678]:
update_subscription(): Could not send notify
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: presence [subscribe.c:713]:
update_subscription(): occured
Jul 30 17:03:01 elx3 /usr/sbin/kamailio[6908]: ERROR: presence [subscribe.c:994]:
handle_subscribe(): in update_subscription
I have found a discussion at http://marc.info/?l=sr-users&m=136624316816288&w=2
which recommends fix_nated_contact(), but I am not really sure about how to add it, or
what conditions to check on whether it should be used. I added the call to
fix_nated_contact() like this:
# Caller NAT detection route
route[NATDETECT] {
#!ifdef WITH_NAT
force_rport();
#
# 1 - Contact header field is searched for occurrence of RFC1918 or rfc6598
addresses.
# 2 - the "received" test is used: address in Via is compared against
source IP address of signaling
# 16 - test if the source port is different from the port in Via
# 64 - test if the source connection of signaling is a WebSocket
# -----
# 83
#!ifdef WITH_WEBSOCKET
# Do NAT traversal stuff for requests from a WebSocket
# connection - even if it is not behind a NAT!
# This won't be needed in the future if Kamailio and the
# WebSocket client support Outbound and Path.
if (nat_uac_test("83")) {
#!else
if (nat_uac_test("19")) {
#!endif
if (is_method("REGISTER")) {
fix_nated_register();
#!ifdef WITH_WEBSOCKET
if (nat_uac_test("64")) fix_nated_contact();
#!endif
} else {
if (is_first_hop())
if (!add_contact_alias()) {
xlog("L_ERR", "Error aliasing
contact <$ct>\n");
sl_send_reply("400", "Bad
Request");
exit;
}
}
setflag(FLT_NATS);
}
#!endif
return;
}
After registration, "kamctl ul show" reports this:
[root@elx3 js]# kamctl ul show
Domain:: location table=512 records=1 max_slot=1
AOR:: admin(a)pbx.villacis.com
Contact:: sip:85017jar@192.168.3.2:41777;transport=ws Q=
Expires:: 584
Callid:: argl25kg0r4qe8lbtbhn9f
Cseq:: 82
User-agent:: SIP.js/0.5.0
Received:: sip:192.168.3.2:41777;transport=WS
State:: CS_NEW
Flags:: 0
Cflag:: 64
Socket:: tls:192.168.2.18:5061
Methods:: 782
Ruid:: uloc-53d971c7-297f-1
Instance:: <urn:uuid:75464840-96b8-4e22-8eaa-5012ba327086>
Reg-Id:: 1
Last-Keepalive:: 1406759390
Last-Modified:: 1406759390
However, it still does not work:
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: WARNING: <core>
[msg_translator.c:2506]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not
be found
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: tm [t_msgbuilder.c:1365]:
assemble_via(): assemble_via: via building failed
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: tm [t_msgbuilder.c:1544]:
build_uac_req(): build_uac_req(): Error while assembling Via
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: tm [uac.c:338]: t_uac_prepare():
t_uac: Error while building message
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: presence [notify.c:1591]:
send_notify_request(): in function tmb.t_request_within
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: presence [notify.c:1678]: notify():
sending Notify not successful
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: presence [subscribe.c:678]:
update_subscription(): Could not send notify
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: presence [subscribe.c:713]:
update_subscription(): occured
Jul 30 17:30:21 elx3 /usr/sbin/kamailio[10624]: ERROR: presence [subscribe.c:994]:
handle_subscribe(): in update_subscription