that's a hint for a very old version, where cfg file language didn't
had support for variables and avpops module was used for comparison
(as you could see, $dd is stored in an avp and them compared with
src ip -- no longer need for such workaround, just do if($si==$dd)
...).
You have to plug the when you force usage of rtp proxy, so you skip
it in such cases.
Hi Daniel
Thank you so much for your feedback.
I came upon the below post, but I'm unable to find the
example Norman posted.
In short the end solution is:
# If both
clients are behind nat we can check to see if they are
behind the same
# external IP
and optimize the media path to go directly between them
else if (
isflagset(2) and isflagset(3) )
{
log(1,
"Both Clients are behind NAT");
#
Store the destination domain into an AVP
avp_printf("i:450", "$dd");
if (
avp_check("i:450", "eq/$src_ip/g") )
{
xlog("L_INFO", "Detected Two Clients Behind the Same NAT -
Disabling Mediaproxy");
#
Do not use mediaproxy as the clients seem to be behind the
same NAT
resetflag(2);
resetflag(3);
}
}
I haven't tested yet, but would I be right in saying my
config should look something like:
####### Routing Logic ########
# Main SIP request routing logic
# - processing of any incoming SIP request starts with this
route
route {
# per request initial checks
route(REQINIT);
# NAT detection
route(NAT);
# Caller NAT detection route
route[NAT] {
#!ifdef WITH_NAT
force_rport();
if (nat_uac_test("19")) {
if (method=="REGISTER") {
fix_nated_register();
} else {
fix_nated_contact();
}
setflag(FLT_NATS);
#
If both clients are behind nat we can check to see if they
are behind the same
#
external IP and optimize the media path to go directly
between them
else if ( isflagset(FLT_NATS) and isflagset(FLT_NATB)
) {
log(1, "Both Clients are behind NAT");
#
Store the destination domain into an AVP
avp_printf("i:450", "$dd");
if ( avp_check("i:450", "eq/$src_ip/g") ) {
xlog("L_INFO",
"Detected Two Clients Behind the Same NAT - Disabling
RTPproxy");
# Do not use rtpproxy as the clients seem to be
behind the same NAT
resetflag(FLT_NATS);
resetflag(FLT_NATB);
}
}
}
#!endif
return;
}
# RTPProxy control
route[RTPPROXY] {
#!ifdef WITH_NAT
if (is_method("BYE")) {
unforce_rtp_proxy();
} else if (is_method("INVITE")){
force_rtp_proxy();
}
if (!has_totag()) add_rr_param(";nat=yes");
#!endif
return;
}
Rgds
Deon
On Dec 20, 2010, at 2:41 PM, Daniel-Constantin Mierla
wrote:
Hello,
On 12/20/10 11:25 AM, Deon Vermeulen wrote:
Hi List
Can someone please help me?
I need to implement PBX Services
for a customer that has 10 IP Phones at his Main site
and then 20 IP Phones located over 5 Branches.
My goal is to have RTP go end to
end and not proxied.
I had a look at the below link and
tried it, but with no luck.
http://kamailio.org/dokuwiki/doku.php/examples:caller-callee-behind-same-nat
Here is a partial output of my
kamailio.cfg file if someone would be so kind to help
me.
#!ifdef WITH_NAT
# ----- rtpproxy params -----
modparam("rtpproxy",
"rtpproxy_sock", "udp:localhost:7722")
# ----- nathelper params -----
modparam("nathelper",
"natping_interval", 30)
modparam("nathelper",
"ping_nated_only", 1)
modparam("nathelper",
"sipping_bflag", FLB_NATSIPPING)
modparam("nathelper",
"sipping_from", "sip:pinger@x.x.x.x")
# params needed for NAT traversal
in other modules
modparam("nathelper|registrar",
"received_avp", "$avp(RECEIVED)")
modparam("usrloc", "nat_bflag",
FLB_NATB)
#!endif
####### Routing Logic ########
# Main SIP request routing logic
# - processing of any incoming SIP
request starts with this route
route {
# per request initial
checks
route(REQINIT);
# NAT detection
route(NAT);
# Caller NAT detection route
route[NAT] {
#!ifdef WITH_NAT
force_rport();
if (nat_uac_test("19")) {
if
(method=="REGISTER") {
fix_nated_register();
} else {
fix_nated_contact();
}
setflag(FLT_NATS);
}
#!endif
return;
}
# RTPProxy control
route[RTPPROXY] {
#!ifdef WITH_NAT
if (is_method("BYE")) {
unforce_rtp_proxy();
} else if
(is_method("INVITE")){
force_rtp_proxy();
}
if (!has_totag())
add_rr_param(";nat=yes");
#!endif
return;
}
what you have to do is to check if the source is natted
and $si==$dd, then callee and caller are behind same nat
(if there is one level of nat), so you don't force
rtpproxy usage.
Cheers,
Daniel
--
Daniel-Constantin Mierla
Kamailio (OpenSER) Advanced Training
Jan 24-26, 2011, Irvine, CA, USA
http://www.asipto.com