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<div>Hello everybody!</div>
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<div>Kamailio works as a Registrar. Additionally, rtpengine is deployed next to it. Using the module rtpgngine I change SDP. Webrtc <-> SIP calls work fine. RTPengine proxies media. It is necessary to understand that when the call comes, I determine what Protocol the call came wss/tcp/udp, and then through the command "rtpengine_manage" change SDP accordingly. Now I have a new task. Wake up mobile customers through push notification. This client may be as WebRTC and also regular SIP. Trying to use TSILO module. </div>
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<div># User location service<br>
route[LOCATION] {<br>
lookup("location"); <br>
$var(rc) = $rc;<br>
if (is_method("INVITE")) <br>
{<br>
if (t_newtran()) <br>
{<br>
route(SEND_PUSH);<br>
xlog("L_INFO", "tsilo store\n");<br>
ts_store();<br>
}<br>
}<br>
switch ($var(rc)) <br>
{<br>
case 1:<br>
xlog("L_INFO", "LOCATION, Subscriber found, RC: $var(rc)\n");<br>
route(RELAY);<br>
break; <br>
case -1:<br>
xlog("L_INFO", "LOCATION, Subscriber doesn't found, RC: $var(rc)\n");<br>
exit;<br>
break;<br>
case -3:<br>
xlog("L_INFO", "LOCATION, Subscriber doesn't found, RC: $var(rc)\n"); <br>
send_reply("404", "Not Found");<br>
exit;<br>
case -2:<br>
xlog("L_INFO", "LOCATION, Method Not Allowed, RC: $var(rc)\n");<br>
send_reply("405", "Method Not Allowed");<br>
exit;<br>
}<br>
}</div>
<div>If a call occurs when the called client is registered, then we go to the route(RELAY), which creates a branch in which I change the SDP. Everything works.</div>
<div><br>
route[RELAY] {</div>
<div> # enable additional event routes for forwarded requests<br>
# - serial forking, RTP relaying handling, a.s.o.<br>
if (is_method("INVITE|BYE")) {<br>
if(!t_is_set("branch_route")) t_on_branch("MANAGE_BRANCH");<br>
}<br>
if (!t_relay()) {<br>
sl_reply_error();<br>
}<br>
exit;<br>
}</div>
<div><br>
And already in MANAGE BRANCH the necessary SDP is put.</div>
<div><br>
If the called party is not registered. In the beginning everything goes well.<br>
I find this caller through a separate server. Send push notification. The client successfully registers on kamailio.</div>
<div><br>
# Handle SIP registrations<br>
route[REGISTRAR] {<br>
if (!is_method("REGISTER")) return;</div>
<div> if(isflagset(FLT_NATS)) <br>
{<br>
setbflag(FLB_NATB);<br>
setbflag(FLB_NATSIPPING);<br>
}<br>
<br>
if(isflagset(FLT_SRC_WSS))<br>
{<br>
setbflag(FLB_DST_WS); <br>
}</div>
<div> if (!save("location")) <br>
{<br>
sl_reply_error();<br>
}<br>
ts_append("location", "$tu")<br>
exit;<br>
}</div>
<div>Next I better show a piece of the log:</div>
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<div>окт 31 14:55:08 /usr/sbin/kamailio[17488]: exec: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} *** cfgtrace:request_route=[REGISTRAR] c=[/etc/kamailio/kamailio.cfg] l=429 a=26 n=ts_append<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} tsilo [ts_append.c:72]: ts_append(): transaction 8800:338205132 found for 1234567890, going to append branches<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} tm [t_lookup.c:1629]: t_lookup_ident_filter(): transaction found<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} registrar [lookup.c:255]: lookup_helper(): contact for [1234567890] found by address<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} registrar [lookup.c:456]: lookup_helper(): instance is<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} tm [t_append_branches.c:77]: t_append_branches(): transaction 8800:338205132 in status 0<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} tm [t_append_branches.c:99]: t_append_branches(): Call uefn7rvufi112jj5lt91: 0 (1) outgoing branches<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} tm [t_append_branches.c:126]: t_append_branches(): Current uri sip:1234567890@10.10.10.1:58027;transport=TCP;rinstance=727a64a3a59c508f<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} <core> [core/msg_translator.c:162]: check_via_address(): (50.7.93.27, uas7i396ceb5.invalid, 0)<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} tm [t_append_branches.c:149]: t_append_branches(): added branch [sip:1234567890@10.10.10.1:58027;transport=TCP;rinstance=727a64a3a59c508f] with ruid [uloc-5dbacb09-4450-7]<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} tm [t_append_branches.c:163]: t_append_branches(): Call uefn7rvufi112jj5lt91: 0 (0) outgoing branches after clear_branches()<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} <core> [core/tcp_main.c:2238]: tcpconn_send_put(): send from reader (17488 (21)), reusing fd<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} <core> [core/tcp_main.c:2473]: tcpconn_do_send(): sending...<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} <core> [core/tcp_main.c:2507]: tcpconn_do_send(): after real write: c= 0x7fb39dde4c68 n=3131 fd=12<br>
окт 31 14:55:08 /usr/sbin/kamailio[17488]: DEBUG: {1 2 REGISTER cY6rPubTvJ3ZbyxOrrvGHw..} <core> [core/tcp_main.c:2508]: tcpconn_do_send(): buf=</div>
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<div>Thus, the transaction wakes up and the initial INVITE is sent to the new registered client without any SDP change! Which eventually leads to 415 error. </div>
<div>Now the question itself. Tell me! As me at this moment intercept this INVITE, to it has passed through in advance prepared path for changing SDP.</div>
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Thank you.</div>
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<div>--<br>
Oleg Podguyko</div>
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