Hello,

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.

Cheers, Daniel

On 12/20/10 2:32 PM, Deon Vermeulen wrote:

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

Destination uri (for $dd) is set after lookup("location"). If you use default config, route[NAT] is executed before.

Cheers, Daniel

On 12/20/10 2:48 PM, Deon Vermeulen wrote:

Thanks again.

So then my config should look something like:

# 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 ( $si==$dd || $si==rd) { 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 3:37 PM, Daniel-Constantin Mierla wrote:

...

Hello,

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.

Cheers, Daniel

On 12/20/10 2:32 PM, Deon Vermeulen wrote:

...

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 http://www.asipto.com/

-- Daniel-Constantin Mierla Kamailio (OpenSER) Advanced Training Jan 24-26, 2011, Irvine, CA, USA http://www.asipto.com

---

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