[OpenSIPS-Users] OpenSIPS 1.7 + NAT + rtpproxy
Ashish Kundu
kash906 at gmail.com
Thu Aug 2 23:27:52 CEST 2012
Opensips is a great product, but I have been having problem in configuring
the nat traversal + rtpproxy with opensips and have spent about a week on
this. I am a novice in this... when opensips runs with the following
opensips.cfg relevant portions -- it raises the following rtpproxy problem:
"ERROR:rtpproxy:select_rtpp_node: script error -no valid set selected"
"ERROR:rtpproxy:force_rtp_proxy: no available proxies"
#-------- nat_traversal params -----
modparam("nat_traversal", "keepalive_interval", 30)
modparam("nat_traversal", "keepalive_method", "OPTIONS")
modparam("nat_traversal", "keepalive_from", "sip:keepalive at a.b.c.d")
modparam("nat_traversal", "keepalive_state_file",
"/var/run/opensips/keepalive_state")
#ak# --- rtpproxy -----
# single rtproxy with specific weight
modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:9999")
modparam("rtpproxy", "nortpproxy_str", "a=sdpmangled:yes\r\n")
modparam("rtpproxy", "db_url", "mysql://opensips:opensipsrw@localhost
/opensips")
#modparam("rtpproxy", "db_table", "nh_rtpp")
modparam("rtpproxy", "rtpp_socket_col", "rtpproxy_sock")
####### Routing Logic ########
# main request routing logic
route{
####nat_traversal info
force_rport();
if (client_nat_test("7")) {
fix_contact();
setflag(5);
}
if ((method=="REGISTER" || method=="SUBSCRIBE" ||
(method=="INVITE" && !has_totag())) && client_nat_test("7"))
{
nat_keepalive();
}
####nat_traversal info ends
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483","Too Many Hops");
exit;
}
##ak#
if ((is_method("INVITE")) && has_totag()) {
#(has_body("application/sdp"))) {
engage_rtp_proxy();
}
if (has_totag()) {
# sequential request withing a dialog should
# take the path determined by record-routing
if (loose_route()) {
if (is_method("BYE")) {
setflag(1); # do accounting ...
setflag(3); # ... even if the transaction
fails
} else if (is_method("INVITE")) {
# even if in most of the cases is useless,
do RR for
# re-INVITEs alos, as some buggy clients do
change route set
# during the dialog.
record_route();
}
# route it out to whatever destination was set by
loose_route()
# in $du (destination URI).
route(1);
} else {
/* uncomment the following lines if you want to
enable presence */
##if (is_method("SUBSCRIBE") && $rd == "your.server.ip.address") {
## # in-dialog subscribe requests
## route(2);
## exit;
##}
if ( is_method("ACK") ) {
if ( t_check_trans() ) {
# non loose-route, but stateful
ACK; must be an ACK after
# a 487 or e.g. 404 from upstream
server
t_relay();
exit;
} else {
# ACK without matching transaction
->
# ignore and discard
exit;
}
}
sl_send_reply("404","Not here");
}
exit;
}
#initial requests
# CANCEL processing
if (is_method("CANCEL"))
{
if (t_check_trans())
t_relay();
#unforce_rtpproxy();
exit;
}
t_check_trans();
# preloaded route checking
if (loose_route()) {
xlog("L_ERR",
"Attempt to route with preloaded Route's
[$fu/$tu/$ru/$ci]");
if (!is_method("ACK"))
sl_send_reply("403","Preload Route denied");
exit;
}
# record routing
if (!is_method("REGISTER|MESSAGE"))
record_route();
# account only INVITEs
if (is_method("INVITE")) {
setflag(1); # do accounting
}
if (!uri==myself)
## replace with following line if multi-domain support is used
##if (!is_uri_host_local())
{
append_hf("P-hint: outbound\r\n");
# if you have some interdomain connections via TLS
##if($rd=="tls_domain1.net") {
## t_relay("tls:domain1.net");
## exit;
##} else if($rd=="tls_domain2.net") {
## t_relay("tls:domain2.net");
## exit;
##}
route(1);
}
# requests for my domain
## uncomment this if you want to enable presence server
## and comment the next 'if' block
## NOTE: uncomment also the definition of route[2] from below
##if( is_method("PUBLISH|SUBSCRIBE"))
## route(2);
if (is_method("PUBLISH"))
{
sl_send_reply("503", "Service Unavailable");
exit;
}
if (is_method("REGISTER"))
{
# authenticate the REGISTER requests (uncomment to enable
auth)
##if (!www_authorize("", "subscriber"))
##{
## www_challenge("", "0");
## exit;
##}
##
##if (!db_check_to())
##{
## sl_send_reply("403","Forbidden auth ID");
## exit;
##}
#---- Request is behind NAT(flag5) save with bflag 6 ----#
#---- Use bflag 7 to start SIP pinging (Options) ----#
if (isflagset(5)) {
setbflag(6);
setbflag(7);
};
if (!save("location"))
sl_reply_error();
exit;
}
if ($rU==NULL) {
# request with no Username in RURI
sl_send_reply("484","Address Incomplete");
exit;
}
# apply DB based aliases (uncomment to enable)
##alias_db_lookup("dbaliases");
if (!lookup("location","m")) {
switch ($retcode) {
case -1:
case -3:
t_newtran();
t_reply("404", "Not Found");
exit;
case -2:
sl_send_reply("405", "Method Not Allowed");
exit;
}
}
# when routing via usrloc, log the missed calls also
setflag(2);
route(1);
}
route[1] {
# for INVITEs enable some additional helper routes
#---- RTP Proxy handling ---#
if (is_method("BYE|CANCEL")) {
unforce_rtp_proxy();
} else if (is_method("INVITE")){
#---- Activates the RTP Proxy for the CALLEE ---#
rtpproxy_offer();
};
#ak## catch and fix replies
#ak#t_on_reply("2");
if (is_method("INVITE")) {
t_on_branch("2");
t_on_reply("2");
t_on_failure("1");
}
if (!t_relay()) {
sl_reply_error();
};
exit;
}
branch_route[2] {
if (client_nat_test("3")) {
fix_contact();
}
xlog("new branch at $ru\n");
}
onreply_route[2] {
if (client_nat_test("7")) {
fix_contact();
if ( is_method("INVITE") && has_body("application/sdp") ){
######ak# (isflagset(5) || isbflagset(6)) &&
rtpproxy_answer();
}
}
xlog("incoming reply\n");
}
failure_route[1] {
if (t_was_cancelled()) {
exit;
}
# uncomment the following lines if you want to block client
# redirect based on 3xx replies.
##if (t_check_status("3[0-9][0-9]")) {
##t_reply("404","Not found");
## exit;
##}
# uncomment the following lines if you want to redirect the failed
# calls to a different new destination
##if (t_check_status("486|408")) {
## sethostport("192.168.2.100:5060");
## # do not set the missed call flag again
## t_relay();
##}
}
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