20 Dec
2010
20 Dec
'10
8:32 a.m.
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.
http://www.mail-archive.com/users@openser.org/msg01932.html
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