25 Mar
2007
25 Mar
'07
10:46 p.m.
Edoardo Serra wrote:
Hi all,
I have an OpenSER acting as a registrar server and as a load
balancer (with dispatcher module) for a cluster of PSTN Gateways based
on Asterisk.
When an inbound call is coming from the PSTN, Asterisks dial
SIP/user@openser and the call is properly forwarded to the correct user
in OpenSER location table
But, if the user wants, for example, to put the call On-Hold, its user
agent sends a RE-INVITE to OpenSER.
My problem is that OpenSER (correctly) dispatch the call to a random
Asterisk GW, and, if it's not the GW which is handling the call, On-Hold
does not work and another call is originated.
The call hold RE-INVITE issued by the called UA should include an R-URI
including the contact address of the GW who initiated the SIP call. So
if a call comes from asterisk.1 the RE-INVITE should include a R-URI
like "INVITE sip:ip.of.asterisk.1" (depending of what asterisk.1 puts in
its contact header).
In your script you always call ds_select_dst and the RE-INVITEs get
routed to a destination from the dispatcher destination set instead of
using the R-URI to route the call to the correct GW.
Since you record route each request you could test if the following works:
# loose-route processing
if (loose_route()) {
# mark routing logic in request
append_hf("P-hint: rr-enforced\r\n");
# don't do ds_select_dst here since the R-URI
# of RE-INVITEs should
# contain the correct GW address
t_relay();
exit;
};
Christian
Tnx in advance for help
Edoardo
My openser.cfg follows
# $Id: ser.cfg,v 1.21.4.1 2003/11/10 15:35:15 andrei Exp $
# ----------- global configuration parameters ------------------------
check_via=yes # (cmd. line: -v)
dns=no # (cmd. line: -r)
rev_dns=no # (cmd. line: -R)
fifo="/tmp/ser_fifo"
#uid=nobody
#gid=nobody
# ------------------ module loading ----------------------------------
loadmodule "/usr/lib/openser/modules/sl.so"
loadmodule "/usr/lib/openser/modules/tm.so"
loadmodule "/usr/lib/openser/modules/rr.so"
loadmodule "/usr/lib/openser/modules/maxfwd.so"
loadmodule "/usr/lib/openser/modules/usrloc.so"
loadmodule "/usr/lib/openser/modules/registrar.so"
loadmodule "/usr/lib/openser/modules/nathelper.so"
loadmodule "/usr/lib/openser/modules/textops.so"
loadmodule "/usr/lib/openser/modules/exec.so"
loadmodule "/usr/lib/openser/modules/uri.so"
loadmodule "/usr/lib/openser/modules/uri_db.so"
loadmodule "/usr/lib/openser/modules/dispatcher.so"
loadmodule "/usr/lib/openser/modules/mysql.so"
loadmodule "/usr/lib/openser/modules/auth.so"
loadmodule "/usr/lib/openser/modules/auth_db.so"
modparam("usrloc", "db_mode", 2)
modparam("usrloc", "db_url",
"mysql://user:pass@192.168.252.5/openser")
modparam("usrloc", "timer_interval", 120)
modparam("auth_db", "calculate_ha1", 0)
modparam("auth_db", "db_url",
"mysql://user:pass@192.168.252.5/db")
modparam("uri_db", "db_url",
"mysql://user:pass@192.168.252.5/openser")
modparam("rr", "enable_full_lr", 1)
modparam("registrar", "nat_flag", 6)
modparam("registrar", "max_expires", 3600)
modparam("registrar", "min_expires", 60)
modparam("registrar", "append_branches", 0)
modparam("registrar", "desc_time_order", 1)
modparam("nathelper", "natping_interval", 20) # Ping interval 20 s
modparam("nathelper", "ping_nated_only", 1) # Ping only clients
behind
NAT
modparam("dispatcher", "force_dst", 1)
# ------------------------- request routing logic -------------------
# main routing logic
route{
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483","Too Many Hops");
exit;
};
if ( msg:len > max_len ) {
sl_send_reply("513", "Message too big");
exit;
};
if ( (method=="OPTIONS") || (method=="SUBSCRIBE") ||
(method=="NOTIFY") ) {
sl_send_reply("405", "Method Not Allowed");
exit;
}
if (!method=="REGISTER") {
record_route();
};
if ((src_ip==ip.of.asterisk.1) || (src_ip==ip.of.asterisk.1)) {
if (!lookup("location")) {
sl_send_reply("486", "Busy here");
exit;
};
if (!t_relay()) {
sl_reply_error();
};
exit;
};
if (nat_uac_test("3")) {
if ((method=="REGISTER") || (method=="INVITE") ||
(method=="OPTIONS")) {
fix_nated_contact();
force_rport();
setflag(6); # Mark as NATed
}
}
if (method=="REGISTER") {
if (!proxy_authorize("exorsa", "openser_view")) {
proxy_challenge("exorsa", "0");
exit;
}
if (!check_to()) {
sl_send_reply("403", "Digest username and URI
username do NOT match! Stay away!");
exit;
}
save("location");
exit;
};
if (method=="INVITE") {
if (!proxy_authorize("exorsa", "openser_view")) {
proxy_challenge("exorsa", "0");
exit;
}
if (!check_from()) {
sl_send_reply("403", "Digest username and URI username do
NOT match! Stay away!");
exit;
}
}
# loose-route processing
if (loose_route()) {
# mark routing logic in request
append_hf("P-hint: rr-enforced\r\n");
route(1);
exit;
};
if (!uri==myself) {
# mark routing logic in request
append_hf("P-hint: outbound\r\n");
route(1);
exit;
};
append_hf("P-hint: usrloc applied\r\n");
route(1);
}
route[1]
{
# !! Nathelper
if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)"
&& !search("^Route:")){
sl_send_reply("479", "We don't forward to private IP
addresses");
exit;
};
# NAT processing of replies; apply to all transactions (for
example,
# re-INVITEs from public to private UA are hard to identify as
# NATed at the moment of request processing); look at replies
t_on_reply("1");
if ((src_ip!=ip.of.asterisk.1) && (src_ip!=ip.of.asterisk.2)) {
ds_select_dst("1", "0");
}
if (!t_relay()) {
sl_reply_error();
};
}
# !! Nathelper
onreply_route[1] {
# NATed transaction ?
if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
fix_nated_contact();
# otherwise, is it a transaction behind a NAT and we did not
# know at time of request processing ? (RFC1918 contacts)
} else if (nat_uac_test("1")) {
fix_nated_contact();
};
}
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