[OpenSIPS-Users] Incorrect header contact when using top hiding dialog
discodog62 at aol.com
discodog62 at aol.com
Wed Jan 25 23:49:12 CET 2012
Thank you very much for the explanation.
-----Original Message-----
From: Anca Vamanu <anca.vamanu at gmail.com>
To: OpenSIPS users mailling list <users at lists.opensips.org>
Sent: Mon, Jan 23, 2012 7:19 pm
Subject: Re: [OpenSIPS-Users] Incorrect header contact when using top hiding dialog
Hi,
You get this behavior because of the way of the way top_hiding is implemented.
The IP:PORT with which the contact is replaced corresponds to the interface on which the message was received. It seems that in your case the message is actually received on the private interface, so it will use that IP as the local contact.
So the top_hiding implementation has a limitation and won't work in your case. The way to extend it is to offer the possibility to set the contact to be used for replacing in an avp before calling the top_hiding function and if set, the function will use that value instead of looking at the interface on which the message was received. You could open a feature request for this on sourceforge.
Regards,
Anca
On Tue, Jan 24, 2012 at 3:24 AM, <discodog62 at aol.com> wrote:
I am hoping someone can point me in the right direction. I am using opensips 1.7.
I have 2 networks using mhomed=1. When I invoke topology_hiding() using the dialog module the header contact uses the internal IP to the external side of the call.
Here is my config. Am I missing something?
debug=3
log_stderror=no
log_facility=LOG_LOCAL0
fork=yes
children=4
disable_tcp=yes
auto_aliases=yes
sip_warning=yes
listen=udp:xxx.xxx.xxx.xxx:5060
listen=udp:10.8.1.139:5060
mhomed=1
group=nobody
user=nobody
####### Modules Section ########
#set module path
mpath="/usr/local/lib64/opensips/modules/"
/* uncomment next line for MySQL DB support */
loadmodule "db_text.so"
loadmodule "signaling.so"
loadmodule "sl.so"
loadmodule "tm.so"
loadmodule "rr.so"
loadmodule "maxfwd.so"
loadmodule "textops.so"
loadmodule "mi_fifo.so"
loadmodule "uri.so"
loadmodule "domain.so"
loadmodule "permissions.so"
loadmodule "dialog.so"
loadmodule "rtpproxy.so"
modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo")
modparam("rr", "append_fromtag", 0)
modparam("uri", "use_uri_table", 0)
modparam("domain", "db_url","text:///zxa/server/opensipsdb")
modparam("domain", "db_mode", 1) # Use caching
modparam("dialog", "db_mode", 1) # Realtime
modparam("dialog", "db_url","text:///zxa/server/opensipsdb")
modparam("permissions", "db_url","text:///zxa/server/opensipsdb")
modparam("rtpproxy","rtpproxy_sock", "udp:127.0.0.1:7891")
####### Routing Logic ########
route{
xlog("=== TOP ===");
xlog("%%%% tu= $tu | fu= $fu | od= $od | ReceivedINT: $Ri | SourceIP: $si %%%");
if (!check_address("1","$si","$sp","$proto"))
{
xlog("=== ACCESS FAILED ===");
xlog("=== $si| $sp | $proto ===");
sl_send_reply("403","Forbidden");
exit;
}
if (!mf_process_maxfwd_header("10"))
{
xlog("=== TOO MANY HOPS ===");
sl_send_reply("483","Too Many Hops");
exit;
}
#CANCEL processing
if (is_method("CANCEL"))
{
xlog("=== CANCEL ===");
if (t_check_trans())
t_relay();
exit;
}
if (is_method("PUBLISH"))
{
sl_send_reply("503", "Service Unavailable");
exit;
}
if (has_totag())
{
xlog("=== HAS TO TAG ===");
if(match_dialog()) && is_method("INVITE|ACK|BYE|UPDATE") #Topology Hide Routine
{
xlog("=== HAS DIALOG MATCH ===");
if (is_method("BYE"))
{
xlog("=== DIALOG MATCH BYE ===");
setflag(1); # Accounting bye
} else if (is_method("INVITE")) {
xlog("=== DIALOG MATCH RE-INVITE LOOSE ===");
record_route();
} else if (is_method("ACK")) {
xlog("=== DIALOG MATCH ACK ===");
}
xlog(" in-dialog topology hiding request - $DLG_dir\n");
route(1);
exit;
}
}
t_check_trans();
if (loose_route())
{
xlog("L_ERR","Attempt to route with preloaded Route's [$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();
}
if (!is_uri_host_local())
{
xlog("Not local so lets just see what happens $rd");
route(1);
}
if ($rU==NULL)
{
# request with no Username in RURI
sl_send_reply("484","Address Incomplete");
exit;
}
if (is_method("INVITE") && (!has_totag()) )
{
xlog("((((((((( NEW CALL ))))))))))");
rewritehostport("10.6.3.87:5068");
topology_hiding();
route(1);
exit;
}
send_reply("420", "Invalid Extension");
exit;
}
route[1] {
#---- RTP Proxy handling ---#
xlog("=== ROUTE 1 ===");
if (is_method("BYE|CANCEL"))
{
unforce_rtp_proxy();
}
if (has_body("application/sdp"))
{
append_hf("P-hint: IE \r\n");
rtpproxy_offer("IE","10.8.1.139");
}
t_on_reply("1");
t_on_failure("1");
if (!t_relay())
{
sl_reply_error();
}
exit;
}
onreply_route[1] {
xlog("=== ON REPLY ROUTE 2 rs= $rs | fu= $fu | od= $od | si= $si | Ri= $Ri ===");
if ( status=~"(183)|(2[0-9][0-9])" )
{
if ($Ri == "10.8.1.139")
{
append_hf("P-hint: RR EI \r\n");
rtpproxy_answer("EI","xxx.xxx.xxx.xxx");
} else {
append_hf("P-hint: RR IE \r\n");
rtpproxy_answer("IE","10.8.1.139");
}
}
}
failure_route[1] {
xlog("=== FAIL ROUTE 2 ===");
unforce_rtp_proxy();
if (t_was_cancelled())
{
exit;
}
}
Here is the Sip traces from the external call.
xxx.xxx.xxx.xxx is my opensips server
A.B.C.D is the the external call.
10.8.1.139 is my internal IP for opensips. On the 180 ringing you can see that the contact is set to 10.8.1.139. It should be xxx.xxx.xxx.xxx
INVITE sip:18584278618 at xxx.xxx.xxx.xxx SIP/2.0
Via: SIP/2.0/UDP A.B.C.D:5068;branch=z9hG4bK1A55
From: IPFax <sip:8583234002 at A.B.C.D>;tag=IPF_PORT_0001_1A54
To: <sip:18584278618 at xxx.xxx.xxx.xxx>
Call-ID: 1211a713-96b4-49e0-affb-6c56b73ae54c at A.B.C.D
CSeq: 1 INVITE
Max-Forwards: 70
Contact: <sip:8583234002 at A.B.C.D:5068>
User-Agent: VFAXSUA/IP_FAX-9.0.5782.743
Allow: INVITE, ACK, BYE, CANCEL, REFER, NOTIFY
Content-Type: application/sdp
Content-Length: 166
v=0
o=IPFax 0 0 IN IP4 A.B.C.D
s=SIP Fax Call
i=IPFax
c=IN IP4 A.B.C.D
t=0 0
m=audio 49176 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=ptime:20
a=sendrecv
--------------------------------------------------------------------------
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP A.B.C.D:5068;branch=z9hG4bK1A55
From: IPFax <sip:8583234002 at A.B.C.D>;tag=IPF_PORT_0001_1A54
To: <sip:18584278618 at xxx.xxx.xxx.xxx>;tag=IPF_PORT_0005_1044
Call-ID: 1211a713-96b4-49e0-affb-6c56b73ae54c at A.B.C.D
CSeq: 1 INVITE
Contact: <sip:10.8.1.139:5060;did=8b3.a5e06475>
User-Agent: VFAXSUA/IP_FAX-9.0.5782.743
Content-Length: 0
--------------------------------------------------------------------------
SIP/2.0 200 OK
Via: SIP/2.0/UDP A.B.C.D:5068;branch=z9hG4bK1A55
From: IPFax <sip:8583234002 at A.B.C.D>;tag=IPF_PORT_0001_1A54
To: <sip:18584278618 at xxx.xxx.xxx.xxx>;tag=IPF_PORT_0005_1044
Call-ID: 1211a713-96b4-49e0-affb-6c56b73ae54c at A.B.C.D
CSeq: 1 INVITE
Contact: <sip:10.8.1.139:5060;did=8b3.a5e06475>
User-Agent: VFAXSUA/IP_FAX-9.0.5782.743
Allow: INVITE, ACK, BYE, CANCEL, REFER, NOTIFY
Content-Type: application/sdp
Content-Length: 179
P-hint: RR EI
v=0
o=IPFax 0 0 IN IP4 10.6.3.87
s=SIP Fax Call
i=IPFax
c=IN IP4 xxx.xxx.xxx.xxx
t=0 0
m=audio 7452 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=ptime:20
a=sendrecv
a=nortpproxy:yes
Thanks.
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